path: root/app/xterm/ctlseqs.txt

                        Xterm Control Sequences

                               Edward Moy
                   University of California, Berkeley

                               Revised by

                             Stephen Gildea
                          X Consortium (1994)

                             Thomas Dickey
                      XFree86 Project (1996-2006)



Definitions

c    The literal character c.

C    A single (required) character.

Ps   A single (usually optional) numeric parameter, composed of one of
     more digits.

Pm   A multiple numeric parameter composed of any number of single
     numeric parameters, separated by ;  character(s).  Individual val-
     ues for the parameters are listed with Ps .

Pt   A text parameter composed of printable characters.

C1 (8-Bit) Control Characters

The xterm program recognizes both 8-bit and 7-bit control characters.
It generates 7-bit controls (by default) or 8-bit if S8C1T is enabled.
The following pairs of 7-bit and 8-bit control characters are equiva-
lent:

ESC D
     Index (IND  is 0x84)
ESC E
     Next Line (NEL  is 0x85)
ESC H
     Tab Set (HTS  is 0x88)
ESC M
     Reverse Index (RI  is 0x8d)
ESC N
     Single Shift Select of G2 Character Set (SS2  is 0x8e): affects
     next character only
ESC O
     Single Shift Select of G3 Character Set (SS3  is 0x8f): affects
     next character only
ESC P
     Device Control String (DCS  is 0x90)
ESC V
     Start of Guarded Area (SPA  is 0x96)
ESC W
     End of Guarded Area (EPA  is 0x97)
ESC X
     Start of String (SOS  is 0x98)
ESC Z
     Return Terminal ID (DECID is 0x9a).  Obsolete form of CSI c  (DA).
ESC [
     Control Sequence Introducer (CSI  is 0x9b)
ESC \
     String Terminator (ST  is 0x9c)
ESC ]
     Operating System Command (OSC  is 0x9d)
ESC ^
     Privacy Message (PM  is 0x9e)
ESC _
     Application Program Command (APC  is 0x9f)

These control characters are used in the vtXXX emulation.

VT100 Mode
Most of these control sequences are standard VT102 control sequences,
but there is support for later DEC VT terminals (i.e., VT220, VT320,
VT420), as well as ISO 6429 and aixterm color controls.  The only VT102
features not supported is auto-repeat, since the only way X provides for
this will affect all windows.  There are additional control sequences to
provide xterm-dependent functions, such as the scrollbar or window size.
Where the function is specified by DEC or ISO 6429, the code assigned to
it is given in parentheses.  The escape codes to designate and invoke
character sets are specified by ISO 2022; see that document for a dis-
cussion of character sets.

Single-character functions
BEL            Bell (Ctrl-G)
BS             Backspace (Ctrl-H)
CR             Carriage Return (Ctrl-M)
ENQ            Return Terminal Status (Ctrl-E).  Default response is an
               empty string, but may be overridden by a resource answer-
               backString.
FF             Form Feed or New Page (NP) (Ctrl-L) same as LF
LF             Line Feed or New Line (NL) (Ctrl-J)
SO             Shift Out (Ctrl-N) -> Switch to Alternate Character Set:
               invokes the G1 character set.
SP             Space.
TAB            Horizontal Tab (HT) (Ctrl-I)
VT             Vertical Tab (Ctrl-K) same as LF
SI             Shift In (Ctrl-O) -> Switch to Standard Character Set:
               invokes the G0 character set (the default).

Controls beginning with ESC (other than those where ESC is part of a
7-bit equivalent to 8-bit C1 controls), ordered by the final charac-
ter(s).
ESC SP F       7-bit controls (S7C1T).
ESC SP G       8-bit controls (S8C1T).
ESC SP L       Set ANSI conformance level 1 (dpANS X3.134.1).
ESC SP M       Set ANSI conformance level 2 (dpANS X3.134.1).
ESC SP N       Set ANSI conformance level 3 (dpANS X3.134.1).
ESC # 3        DEC double-height line, top half (DECDHL)
ESC # 4        DEC double-height line, bottom half (DECDHL)
ESC # 5        DEC single-width line (DECSWL)
ESC # 6        DEC double-width line (DECDWL)
ESC # 8        DEC Screen Alignment Test (DECALN)
ESC % @        Select default character set, ISO 8859-1 (ISO 2022)
ESC % G        Select UTF-8 character set (ISO 2022)
ESC ( C        Designate G0 Character Set (ISO 2022)
ESC ) C        Designate G1 Character Set (ISO 2022)
ESC * C        Designate G2 Character Set (ISO 2022)
ESC + C        Designate G3 Character Set (ISO 2022)
               Final character C for designating character sets (0 , A
               and B  apply to VT100 and up, the remainder to VT220 and
               up):
                 C = 0  -> DEC Special Character and Line Drawing Set
                 C = A  -> United Kingdom (UK)
                 C = B  -> United States (USASCII)
                 C = 4  -> Dutch
                 C = C  or 5  -> Finnish
                 C = R  -> French
                 C = Q  -> French Canadian
                 C = K  -> German
                 C = Y  -> Italian
                 C = E  or 6  -> Norwegian/Danish
                 C = Z  -> Spanish
                 C = H  or 7  -> Swedish
                 C = =  -> Swiss
ESC 7          Save Cursor (DECSC)
ESC 8          Restore Cursor (DECRC)
ESC =          Application Keypad (DECPAM)
ESC >          Normal Keypad (DECPNM)
ESC F          Cursor to lower left corner of screen (if enabled by the
               hpLowerleftBugCompat resource).
ESC c          Full Reset (RIS)
ESC l          Memory Lock (per HP terminals).  Locks memory above the
               cursor.
ESC m          Memory Unlock (per HP terminals)
ESC n          Invoke the G2 Character Set as GL (LS2).
ESC o          Invoke the G3 Character Set as GL (LS3).
ESC |          Invoke the G3 Character Set as GR (LS3R).
ESC }          Invoke the G2 Character Set as GR (LS2R).
ESC ~          Invoke the G1 Character Set as GR (LS1R).

Application Program-Control functions
APC Pt ST      xterm implements no APC  functions; Pt is ignored.  Pt
               need not be printable characters.

Device-Control functions
DCS Ps; Ps| Pt ST
               User-Defined Keys (DECUDK).  The first parameter:
                 Ps = 0  -> Clear all UDK definitions before starting
               (default)
                 Ps = 1  -> Erase Below (default)
               The second parameter:
                 Ps = 0  -> Lock the keys (default)
                 Ps = 1  -> Do not lock.
               The third parameter is a ';'-separated list of strings
               denoting the key-code separated by a '/' from the hex-
               encoded key value.  The key codes correspond to the DEC
               function-key codes (e.g., F6=17).
DCS $ q Pt ST  Request Status String (DECRQSS).  The string following
               the "q" is one of the following:
                 " q     -> DECSCA
                 " p     -> DECSCL
                 r       -> DECSTBM
                 m       -> SGR
               xterm responds with DCS 1 $ r Pt ST for valid requests,
               replacing the Pt with the corresponding CSI string, or
               DCS 0 $ r Pt ST for invalid requests.
DCS + q Pt ST  Request Termcap/Terminfo String (xterm, experimental).
               The string following the "q" is a list of names encoded
               in hexadecimal (2 digits per character) separated by ;
               which correspond to termcap or terminfo key names.
               xterm responds with DCS 1 + r Pt ST for valid requests,
               adding to Pt an = , and the value of the corresponding
               string that xterm would send, or DCS 0 + r Pt ST for
               invalid requests.  The strings are encoded in hexadecimal
               (2 digits per character).

Functions using CSI , ordered by the final character(s)
CSI Ps @       Insert Ps (Blank) Character(s) (default = 1) (ICH)
CSI Ps A       Cursor Up Ps Times (default = 1) (CUU)
CSI Ps B       Cursor Down Ps Times (default = 1) (CUD)
CSI Ps C       Cursor Forward Ps Times (default = 1) (CUF)
CSI Ps D       Cursor Backward Ps Times (default = 1) (CUB)
CSI Ps E       Cursor Next Line Ps Times (default = 1) (CNL)
CSI Ps F       Cursor Preceding Line Ps Times (default = 1) (CPL)
CSI Ps G       Cursor Character Absolute  [column] (default = [row,1])
               (CHA)
CSI Ps ; Ps H  Cursor Position [row;column] (default = [1,1]) (CUP)
CSI Ps I       Cursor Forward Tabulation Ps tab stops (default = 1)
               (CHT)
CSI Ps J       Erase in Display (ED)
                 Ps = 0  -> Erase Below (default)
                 Ps = 1  -> Erase Above
                 Ps = 2  -> Erase All
                 Ps = 3  -> Erase Saved Lines (xterm)
CSI ? Ps J     Erase in Display (DECSED)
                 Ps = 0  -> Selective Erase Below (default)
                 Ps = 1  -> Selective Erase Above
                 Ps = 2  -> Selective Erase All
CSI Ps K       Erase in Line (EL)
                 Ps = 0  -> Erase to Right (default)
                 Ps = 1  -> Erase to Left
                 Ps = 2  -> Erase All
CSI ? Ps K     Erase in Line (DECSEL)
                 Ps = 0  -> Selective Erase to Right (default)
                 Ps = 1  -> Selective Erase to Left
                 Ps = 2  -> Selective Erase All
CSI Ps L       Insert Ps Line(s) (default = 1) (IL)
CSI Ps M       Delete Ps Line(s) (default = 1) (DL)
CSI Ps P       Delete Ps Character(s) (default = 1) (DCH)
CSI Ps S       Scroll up Ps lines (default = 1) (SU)
CSI Ps T       Scroll down Ps lines (default = 1) (SD)
CSI Ps ; Ps ; Ps ; Ps ; Ps T
               Initiate highlight mouse tracking.  Parameters are
               [func;startx;starty;firstrow;lastrow].  See the section
               Mouse Tracking.
CSI Ps X       Erase Ps Character(s) (default = 1) (ECH)
CSI Ps Z       Cursor Backward Tabulation Ps tab stops (default = 1)
               (CBT)
CSI Pm `       Character Position Absolute  [column] (default = [row,1])
               (HPA)
CSI Ps b       Repeat the preceding graphic character Ps times (REP)
CSI Ps c       Send Device Attributes (Primary DA)
                 Ps = 0  or omitted -> request attributes from terminal.
               The response depends on the decTerminalID resource set-
               ting.
                 -> CSI ? 1 ; 2 c  (``VT100 with Advanced Video
               Option'')
                 -> CSI ? 1 ; 0 c  (``VT101 with No Options'')
                 -> CSI ? 6 c  (``VT102'')
                 -> CSI ? 6 0 ; 1 ; 2 ; 6 ; 8 ; 9 ; 1 5 ; c  (``VT220'')
               The VT100-style response parameters do not mean anything
               by themselves.  VT220 parameters do, telling the host
               what features the terminal supports:
                 -> 1  132-columns
                 -> 2  Printer
                 -> 6  Selective erase
                 -> 8  User-defined keys
                 -> 9  National replacement character sets
                 -> 1 5  Technical characters
                 -> 2 2  ANSI color, e.g., VT525
                 -> 2 9  ANSI text locator (i.e., DEC Locator mode)
CSI > Ps c     Send Device Attributes (Secondary DA)
                 Ps = 0  or omitted -> request the terminal's identifi-
               cation code.  The response depends on the decTerminalID
               resource setting.  It should apply only to VT220 and up,
               but xterm extends this to VT100.
                 -> CSI  > Pp ; Pv ; Pc c
               where Pp denotes the terminal type
                 -> 0  (``VT100'')
                 -> 1  (``VT220'')
               and Pv is the firmware version (for xterm, this is the
               XFree86 patch number, starting with 95).  In a DEC termi-
               nal, Pc indicates the ROM cartridge registration number
               and is always zero.
CSI Pm d       Line Position Absolute  [row] (default = [1,column])
               (VPA)
CSI Ps ; Ps f  Horizontal and Vertical Position [row;column] (default =
               [1,1]) (HVP)
CSI Ps g       Tab Clear (TBC)
                 Ps = 0  -> Clear Current Column (default)
                 Ps = 3  -> Clear All
CSI Pm h       Set Mode (SM)
                 Ps = 2  -> Keyboard Action Mode (AM)
                 Ps = 4  -> Insert Mode (IRM)
                 Ps = 1 2  -> Send/receive (SRM)
                 Ps = 2 0  -> Automatic Newline (LNM)
CSI ? Pm h     DEC Private Mode Set (DECSET)
                 Ps = 1  -> Application Cursor Keys (DECCKM)
                 Ps = 2  -> Designate USASCII for character sets G0-G3
               (DECANM), and set VT100 mode.
                 Ps = 3  -> 132 Column Mode (DECCOLM)
                 Ps = 4  -> Smooth (Slow) Scroll (DECSCLM)
                 Ps = 5  -> Reverse Video (DECSCNM)
                 Ps = 6  -> Origin Mode (DECOM)
                 Ps = 7  -> Wraparound Mode (DECAWM)
                 Ps = 8  -> Auto-repeat Keys (DECARM)
                 Ps = 9  -> Send Mouse X & Y on button press.  See the
               section Mouse Tracking.
                 Ps = 1 0  -> Show toolbar (rxvt)
                 Ps = 1 2  -> Start Blinking Cursor (att610)
                 Ps = 1 8  -> Print form feed (DECPFF)
                 Ps = 1 9  -> Set print extent to full screen (DECPEX)
                 Ps = 2 5  -> Show Cursor (DECTCEM)
                 Ps = 3 0  -> Show scrollbar (rxvt).
                 Ps = 3 5  -> Enable font-shifting functions (rxvt).
                 Ps = 3 8  -> Enter Tektronix Mode (DECTEK)
                 Ps = 4 0  -> Allow 80 -> 132 Mode
                 Ps = 4 1  -> more(1) fix (see curses resource)
                 Ps = 4 2  -> Enable Nation Replacement Character sets
               (DECNRCM)
                 Ps = 4 4  -> Turn On Margin Bell
                 Ps = 4 5  -> Reverse-wraparound Mode
                 Ps = 4 6  -> Start Logging (normally disabled by a com-
               pile-time option)
                 Ps = 4 7  -> Use Alternate Screen Buffer (unless dis-
               abled by the titeInhibit resource)
                 Ps = 6 6  -> Application keypad (DECNKM)
                 Ps = 6 7  -> Backarrow key sends backspace (DECBKM)
                 Ps = 1 0 0 0  -> Send Mouse X & Y on button press and
               release.  See the section Mouse Tracking.
                 Ps = 1 0 0 1  -> Use Hilite Mouse Tracking.
                 Ps = 1 0 0 2  -> Use Cell Motion Mouse Tracking.
                 Ps = 1 0 0 3  -> Use All Motion Mouse Tracking.
                 Ps = 1 0 1 0  -> Scroll to bottom on tty output (rxvt).
                 Ps = 1 0 1 1  -> Scroll to bottom on key press (rxvt).
                 Ps = 1 0 3 4  -> Interpret "meta" key, sets eighth bit.
               (enables the eightBitInput resource).
                 Ps = 1 0 3 5  -> Enable special modifiers for Alt and
               NumLock keys.
                 Ps = 1 0 3 6  -> Send ESC when Meta modifies a key
               (enables the metaSendsEscape resource).
                 Ps = 1 0 3 7  -> Send DEL from the editing-keypad
               Delete key
                 Ps = 1 0 4 7  -> Use Alternate Screen Buffer (unless
               disabled by the titeInhibit resource)
                 Ps = 1 0 4 8  -> Save cursor as in DECSC (unless dis-
               abled by the titeInhibit resource)
                 Ps = 1 0 4 9  -> Save cursor as in DECSC and use Alter-
               nate Screen Buffer, clearing it first (unless disabled by
               the titeInhibit resource).  This combines the effects of
               the 1 0 4 7  and 1 0 4 8  modes.  Use this with terminfo-
               based applications rather than the 4 7  mode.
                 Ps = 1 0 5 1  -> Set Sun function-key mode.
                 Ps = 1 0 5 2  -> Set HP function-key mode.
                 Ps = 1 0 5 3  -> Set SCO function-key mode.
                 Ps = 1 0 6 0  -> Set legacy keyboard emulation (X11R6).
                 Ps = 1 0 6 1  -> Set VT220 keyboard emulation.
                 Ps = 2 0 0 4  -> Set bracketed paste mode.
CSI Pm i       Media Copy (MC)
                 Ps = 0  -> Print screen (default)
                 Ps = 4  -> Turn off printer controller mode
                 Ps = 5  -> Turn on printer controller mode
CSI ? Pm i     Media Copy (MC, DEC-specific)
                 Ps = 1  -> Print line containing cursor
                 Ps = 4  -> Turn off autoprint mode
                 Ps = 5  -> Turn on autoprint mode
                 Ps = 1  0  -> Print composed display, ignores DECPEX
                 Ps = 1  1  -> Print all pages
CSI Pm l       Reset Mode (RM)
                 Ps = 2  -> Keyboard Action Mode (AM)
                 Ps = 4  -> Replace Mode (IRM)
                 Ps = 1 2  -> Send/receive (SRM)
                 Ps = 2 0  -> Normal Linefeed (LNM)
CSI ? Pm l     DEC Private Mode Reset (DECRST)
                 Ps = 1  -> Normal Cursor Keys (DECCKM)
                 Ps = 2  -> Designate VT52 mode (DECANM).
                 Ps = 3  -> 80 Column Mode (DECCOLM)
                 Ps = 4  -> Jump (Fast) Scroll (DECSCLM)
                 Ps = 5  -> Normal Video (DECSCNM)
                 Ps = 6  -> Normal Cursor Mode (DECOM)
                 Ps = 7  -> No Wraparound Mode (DECAWM)
                 Ps = 8  -> No Auto-repeat Keys (DECARM)
                 Ps = 9  -> Don't Send Mouse X & Y on button press
                 Ps = 1 0  -> Hide toolbar (rxvt)
                 Ps = 1 2  -> Stop Blinking Cursor (att610)
                 Ps = 1 8  -> Don't print form feed (DECPFF)
                 Ps = 1 9  -> Limit print to scrolling region (DECPEX)
                 Ps = 2 5  -> Hide Cursor (DECTCEM)
                 Ps = 3 0  -> Don't show scrollbar (rxvt).
                 Ps = 3 5  -> Disable font-shifting functions (rxvt).
                 Ps = 4 0  -> Disallow 80 -> 132 Mode
                 Ps = 4 1  -> No more(1) fix (see curses resource)
                 Ps = 4 2  -> Disable Nation Replacement Character sets
               (DECNRCM)
                 Ps = 4 4  -> Turn Off Margin Bell
                 Ps = 4 5  -> No Reverse-wraparound Mode
                 Ps = 4 6  -> Stop Logging (normally disabled by a com-
               pile-time option)
                 Ps = 4 7  -> Use Normal Screen Buffer
                 Ps = 6 6  -> Numeric keypad (DECNKM)
                 Ps = 6 7  -> Backarrow key sends delete (DECBKM)
                 Ps = 1 0 0 0  -> Don't Send Mouse X & Y on button press
               and release.  See the section Mouse Tracking.
                 Ps = 1 0 0 1  -> Don't Use Hilite Mouse Tracking
                 Ps = 1 0 0 2  -> Don't Use Cell Motion Mouse Tracking
                 Ps = 1 0 0 3  -> Don't Use All Motion Mouse Tracking
                 Ps = 1 0 1 0  -> Don't scroll to bottom on tty output
               (rxvt).
                 Ps = 1 0 1 1  -> Don't scroll to bottom on key press
               (rxvt).
                 Ps = 1 0 3 4  -> Don't interpret "meta" key (disables
               the eightBitInput resource).
                 Ps = 1 0 3 5  -> Disable special modifiers for Alt and
               NumLock keys.
                 Ps = 1 0 3 6  -> Don't send ESC when Meta modifies a
               key (disables the metaSendsEscape resource).
                 Ps = 1 0 3 7  -> Send VT220 Remove from the editing-
               keypad Delete key
                 Ps = 1 0 4 7  -> Use Normal Screen Buffer, clearing
               screen first if in the Alternate Screen (unless disabled
               by the titeInhibit resource)
                 Ps = 1 0 4 8  -> Restore cursor as in DECRC (unless
               disabled by the titeInhibit resource)
                 Ps = 1 0 4 9  -> Use Normal Screen Buffer and restore
               cursor as in DECRC (unless disabled by the titeInhibit
               resource).  This combines the effects of the 1 0 4 7  and
               1 0 4 8  modes.  Use this with terminfo-based applica-
               tions rather than the 4 7  mode.
                 Ps = 1 0 5 1  -> Reset Sun function-key mode.
                 Ps = 1 0 5 2  -> Reset HP function-key mode.
                 Ps = 1 0 5 3  -> Reset SCO function-key mode.
                 Ps = 1 0 6 0  -> Reset legacy keyboard emulation
               (X11R6).
                 Ps = 1 0 6 1  -> Reset keyboard emulation to Sun/PC
               style.
                 Ps = 2 0 0 4  -> Reset bracketed paste mode.
CSI Pm m       Character Attributes (SGR)
                 Ps = 0  -> Normal (default)
                 Ps = 1  -> Bold
                 Ps = 4  -> Underlined
                 Ps = 5  -> Blink (appears as Bold)
                 Ps = 7  -> Inverse
                 Ps = 8  -> Invisible, i.e., hidden (VT300)
                 Ps = 2 2  -> Normal (neither bold nor faint)
                 Ps = 2 4  -> Not underlined
                 Ps = 2 5  -> Steady (not blinking)
                 Ps = 2 7  -> Positive (not inverse)
                 Ps = 2 8  -> Visible, i.e., not hidden (VT300)
                 Ps = 3 0  -> Set foreground color to Black
                 Ps = 3 1  -> Set foreground color to Red
                 Ps = 3 2  -> Set foreground color to Green
                 Ps = 3 3  -> Set foreground color to Yellow
                 Ps = 3 4  -> Set foreground color to Blue
                 Ps = 3 5  -> Set foreground color to Magenta
                 Ps = 3 6  -> Set foreground color to Cyan
                 Ps = 3 7  -> Set foreground color to White
                 Ps = 3 9  -> Set foreground color to default (original)
                 Ps = 4 0  -> Set background color to Black
                 Ps = 4 1  -> Set background color to Red
                 Ps = 4 2  -> Set background color to Green
                 Ps = 4 3  -> Set background color to Yellow
                 Ps = 4 4  -> Set background color to Blue
                 Ps = 4 5  -> Set background color to Magenta
                 Ps = 4 6  -> Set background color to Cyan
                 Ps = 4 7  -> Set background color to White
                 Ps = 4 9  -> Set background color to default (origi-
               nal).

               If 16-color support is compiled, the following apply.
               Assume that xterm's resources are set so that the ISO
               color codes are the first 8 of a set of 16.  Then the
               aixterm colors are the bright versions of the ISO colors:
                 Ps = 9 0  -> Set foreground color to Black
                 Ps = 9 1  -> Set foreground color to Red
                 Ps = 9 2  -> Set foreground color to Green
                 Ps = 9 3  -> Set foreground color to Yellow
                 Ps = 9 4  -> Set foreground color to Blue
                 Ps = 9 5  -> Set foreground color to Magenta
                 Ps = 9 6  -> Set foreground color to Cyan
                 Ps = 9 7  -> Set foreground color to White
                 Ps = 1 0 0  -> Set background color to Black
                 Ps = 1 0 1  -> Set background color to Red
                 Ps = 1 0 2  -> Set background color to Green
                 Ps = 1 0 3  -> Set background color to Yellow
                 Ps = 1 0 4  -> Set background color to Blue
                 Ps = 1 0 5  -> Set background color to Magenta
                 Ps = 1 0 6  -> Set background color to Cyan
                 Ps = 1 0 7  -> Set background color to White

               If xterm is compiled with the 16-color support disabled,
               it supports the following, from rxvt:
                 Ps = 1 0 0  -> Set foreground and background color to
               default

               If 88- or 256-color support is compiled, the following
               apply.
                 Ps = 3 8  ; 5  ; Ps -> Set foreground color to the sec-
               ond Ps
                 Ps = 4 8  ; 5  ; Ps -> Set background color to the sec-
               ond Ps

CSI > Ps; Ps m Set or reset resource-values used by xterm to decide
               whether to construct escape sequences holding information
               about the modifiers pressed with a given key.  The first
               parameter identifies the resource to set/reset.  The sec-
               ond parameter is the value to assign to the resource.  If
               the second parameter is omitted, the resource is reset to
               its initial value.
                 -> 1  modifyCursorKeys
                 -> 2  modifyFunctionKeys
                 -> 4  modifyOtherKeys
               If no parameters are given, all resources are reset to
               their initial values.
CSI Ps n       Device Status Report (DSR)
                 Ps = 5  -> Status Report CSI 0 n  (``OK'')
                 Ps = 6  -> Report Cursor Position (CPR) [row;column] as
               CSI r ; c R
CSI > n        Set resource-value modifyFunctionKeys used by xterm to
               allow user to construct extended-numbering function keys
               using shift- and control-modifiers.
CSI ? Ps n     Device Status Report (DSR, DEC-specific)
                 Ps = 6  -> Report Cursor Position (CPR) [row;column] as
               CSI ? r ; c R (assumes page is zero).
                 Ps = 1 5  -> Report Printer status as CSI ? 1 0  n
               (ready) or CSI ? 1 1  n  (not ready)
                 Ps = 2 5  -> Report UDK status as CSI ? 2 0  n
               (unlocked) or CSI ? 2 1  n  (locked)
                 Ps = 2 6  -> Report Keyboard status as
               CSI ? 2 7  ;  1  ;  0  ;  0  n  (North American)
               The last two parameters apply to VT400 & up, and denote
               keyboard ready and LK01 respectively.
                 Ps = 5 3  -> Report Locator status as
               CSI ? 5 3  n  Locator available, if compiled-in, or
               CSI ? 5 0  n  No Locator, if not.
CSI ! p        Soft terminal reset (DECSTR)
CSI Ps ; Ps " p
               Set conformance level (DECSCL) Valid values for the first
               parameter:
                 Ps = 6 1  -> VT100
                 Ps = 6 2  -> VT200
                 Ps = 6 3  -> VT300
               Valid values for the second parameter:
                 Ps = 0  -> 8-bit controls
                 Ps = 1  -> 7-bit controls (always set for VT100)
                 Ps = 2  -> 8-bit controls
CSI Ps " q     Select character protection attribute (DECSCA).  Valid
               values for the parameter:
                 Ps = 0  -> DECSED and DECSEL can erase (default)
                 Ps = 1  -> DECSED and DECSEL cannot erase
                 Ps = 2  -> DECSED and DECSEL can erase
CSI Ps ; Ps r  Set Scrolling Region [top;bottom] (default = full size of
               window) (DECSTBM)
CSI ? Pm r     Restore DEC Private Mode Values.  The value of Ps previ-
               ously saved is restored.  Ps values are the same as for
               DECSET.
CSI Pt; Pl; Pb; Pr; Ps$ r
               Change Attributes in Rectangular Area (DECCARA).
                 Pt; Pl; Pb; Pr denotes the rectangle.
                 Ps denotes the SGR attributes to change: 0, 1, 4, 5, 7
CSI s          Save cursor (ANSI.SYS)
CSI ? Pm s     Save DEC Private Mode Values.  Ps values are the same as
               for DECSET.
CSI Ps ; Ps ; Ps t
               Window manipulation (from dtterm, as well as extensions).
               These controls may be disabled using the allowWindowOps
               resource.  Valid values for the first (and any additional
               parameters) are:
                 Ps = 1  -> De-iconify window.
                 Ps = 2  -> Iconify window.
                 Ps = 3  ; x ; y -> Move window to [x, y].
                 Ps = 4  ; height ; width -> Resize the xterm window to
               height and width in pixels.
                 Ps = 5  -> Raise the xterm window to the front of the
               stacking order.
                 Ps = 6  -> Lower the xterm window to the bottom of the
               stacking order.
                 Ps = 7  -> Refresh the xterm window.
                 Ps = 8  ; height ; width -> Resize the text area to
               [height;width] in characters.
                 Ps = 9  ; 0  -> Restore maximized window.
                 Ps = 9  ; 1  -> Maximize window (i.e., resize to screen
               size).
                 Ps = 1 1  -> Report xterm window state.  If the xterm
               window is open (non-iconified), it returns CSI 1 t .  If
               the xterm window is iconified, it returns CSI 2 t .
                 Ps = 1 3  -> Report xterm window position as CSI 3 ; x;
               yt
                 Ps = 1 4  -> Report xterm window in pixels as CSI  4  ;
               height ;  width t
                 Ps = 1 8  -> Report the size of the text area in char-
               acters as CSI  8  ;  height ;  width t
                 Ps = 1 9  -> Report the size of the screen in charac-
               ters as CSI  9  ;  height ;  width t
                 Ps = 2 0  -> Report xterm window's icon label as OSC  L
               label ST
                 Ps = 2 1  -> Report xterm window's title as OSC  l
               title ST
                 Ps >= 2 4  -> Resize to Ps lines (DECSLPP)
CSI Pt; Pl; Pb; Pr; Ps$ t
               Reverse Attributes in Rectangular Area (DECRARA).
                 Pt; Pl; Pb; Pr denotes the rectangle.
                 Ps denotes the attributes to reverse. 1, 4, 5, 7
CSI u          Save cursor (ANSI.SYS)
CSI Pt; Pl; Pb; Pr; Pp; Pt; Pl; Pp$ v
               Copy Rectangular Area (DECCRA)
                 Pt; Pl; Pb; Pr denotes the rectangle.
                 Pp denotes the source page.
                 Pt; Pl denotes the target location.
                 Pp denotes the target page.
CSI Pt ; Pl ; Pb ; Pr ' w
               Enable Filter Rectangle (DECEFR)
               Parameters are [top;left;bottom;right].
               Defines the coordinates of a filter rectangle and acti-
               vates it.  Anytime the locator is detected outside of the
               filter rectangle, an outside rectangle event is generated
               and the rectangle is disabled.  Filter rectangles are
               always treated as "one-shot" events.  Any parameters that
               are omitted default to the current locator position.  If
               all parameters are omitted, any locator motion will be
               reported.  DECELR always cancels any prevous rectangle
               definition.
CSI Ps x       Request Terminal Parameters (DECREQTPARM)
               if Ps is a "0" (default) or "1", and xterm is emulating
               VT100, the control sequence elicits a response of the
               same form whose parameters describe the terminal:
                 Ps -> the given Ps incremented by 2.
                 1  -> no parity
                 1  -> eight bits
                 1  2  8  -> transmit 38.4k baud
                 1  2  8  -> receive 38.4k baud
                 1  -> clock multiplier
                 0  -> STP flags
CSI Ps x       Select Attribute Change Extent (DECSACE).
                 Ps = 0  -> from start to end position, wrapped
                 Ps = 1  -> from start to end position, wrapped
                 Ps = 2  -> rectangle (exact).
CSI Pc; Pt; Pl; Pb; Pr$ x
               Fill Rectangular Area (DECFRA).
                 Pc is the character to use.
                 Pt; Pl; Pb; Pr denotes the rectangle.
CSI Ps ; Pu ' z
               Enable Locator Reporting (DECELR)
               Valid values for the first parameter:
                 Ps = 0  -> Locator disabled (default)
                 Ps = 1  -> Locator enabled
                 Ps = 2  -> Locator enabled for one report, then dis-
               abled
               The second parameter specifies the coordinate unit for
               locator reports.
               Valid values for the second parameter:
                 Pu = 0  or omitted -> default to character cells
                 Pu = 1  -> device physical pixels
                 Pu = 2  -> character cells
CSI Pt; Pl; Pb; Pr$ z
               Erase Rectangular Area (DECERA).
                 Pt; Pl; Pb; Pr denotes the rectangle.
CSI Pm ' {     Select Locator Events (DECSLE)
               Valid values for the first (and any additional parame-
               ters) are:
                 Ps = 0  -> only respond to explicit host requests
               (DECRQLP)
                            (default) also cancels any filter rectangle
                 Ps = 1  -> report button down transitions
                 Ps = 2  -> do not report button down transitions
                 Ps = 3  -> report button up transitions
                 Ps = 4  -> do not report button up transitions
CSI Pt; Pl; Pb; Pr$ {
               Selective Erase Rectangular Area (DECSERA).
                 Pt; Pl; Pb; Pr denotes the rectangle.
CSI Ps ' |     Request Locator Position (DECRQLP)
               Valid values for the parameter are:
                 Ps = 0 , 1 or omitted -> transmit a single DECLRP loca-
               tor report

               If Locator Reporting has been enabled by a DECELR, xterm
               will respond with a DECLRP Locator Report.  This report
               is also generated on button up and down events if they
               have been enabled with a DECSLE, or when the locator is
               detected outside of a filter rectangle, if filter rectan-
               gles have been enabled with a DECEFR.

                 -> CSI Pe ; Pb ; Pr ; Pc ; Pp &  w

               Parameters are [event;button;row;column;page].
               Valid values for the event:
                 Pe = 0  -> locator unavailable - no other parameters
               sent
                 Pe = 1  -> request - xterm received a DECRQLP
                 Pe = 2  -> left button down
                 Pe = 3  -> left button up
                 Pe = 4  -> middle button down
                 Pe = 5  -> middle button up
                 Pe = 6  -> right button down
                 Pe = 7  -> right button up
                 Pe = 8  -> M4 button down
                 Pe = 9  -> M4 button up
                 Pe = 1 0  -> locator outside filter rectangle
               ``button'' parameter is a bitmask indicating which but-
               tons are pressed:
                 Pb = 0  -> no buttons down
                 Pb & 1  -> right button down
                 Pb & 2  -> middle button down
                 Pb & 4  -> left button down
                 Pb & 8  -> M4 button down
               ``row'' and ``column'' parameters are the coordinates of
               the locator position in the xterm window, encoded as
               ASCII decimal.
               The ``page'' parameter is not used by xterm, and will be
               omitted.

Operating System Controls
OSC Ps ; Pt ST
OSC Ps ; Pt BEL
               Set Text Parameters.  For colors and font, if Pt is a
               "?", the control sequence elicits a response which con-
               sists of the control sequence which would set the corre-
               sponding value.  The dtterm control sequences allow you
               to determine the icon name and window title.
                 Ps = 0  -> Change Icon Name and Window Title to Pt
                 Ps = 1  -> Change Icon Name to Pt
                 Ps = 2  -> Change Window Title to Pt
                 Ps = 3  -> Set X property on top-level window. Pt
               should be in the form "prop=value", or just "prop" to
               delete the property
                 Ps = 4  ; c ; spec -> Change Color Number c to the
               color specified by spec, i.e., a name or RGB specifica-
               tion as per XParseColor.  Any number of c name pairs may
               be given.  The color numbers correspond to the ANSI col-
               ors 0-7, their bright versions 8-15, and if supported,
               the remainder of the 88-color or 256-color table.

               If a "?" is given rather than a name or RGB specifica-
               tion, xterm replies with a control sequence of the same
               form which can be used to set the corresponding color.
               Because more than one pair of color number and specifica-
               tion can be given in one control sequence, xterm can make
               more than one reply.

               The 8 colors which may be set using 1 0  through 1 7  are
               denoted dynamic colors, since the corresponding control
               sequences were the first means for setting xterm's colors
               dynamically, i.e., after it was started.  They are not
               the same as the ANSI colors.  One or more parameters is
               expected for Pt.  Each successive parameter changes the
               next color in the list.  The value of Ps tells the start-
               ing point in the list.  The colors are specified by name
               or RGB specification as per XParseColor.

               If a "?" is given rather than a name or RGB specifica-
               tion, xterm replies with a control sequence of the same
               form which can be used to set the corresponding dynamic
               color.  Because more than one pair of color number and
               specification can be given in one control sequence, xterm
               can make more than one reply.

                 Ps = 1 0  -> Change VT100 text foreground color to Pt
                 Ps = 1 1  -> Change VT100 text background color to Pt
                 Ps = 1 2  -> Change text cursor color to Pt
                 Ps = 1 3  -> Change mouse foreground color to Pt
                 Ps = 1 4  -> Change mouse background color to Pt
                 Ps = 1 5  -> Change Tektronix foreground color to Pt
                 Ps = 1 6  -> Change Tektronix background color to Pt
                 Ps = 1 7  -> Change highlight color to Pt
                 Ps = 1 8  -> Change Tektronix cursor color to Pt

                 Ps = 4 6  -> Change Log File to Pt (normally disabled
               by a compile-time option)

                 Ps = 5 0  -> Set Font to Pt If Pt begins with a "#",
               index in the font menu, relative (if the next character
               is a plus or minus sign) or absolute.  A number is
               expected but not required after the sign (the default is
               the current entry for relative, zero for absolute index-
               ing).

                 Ps = 5 1  (reserved for Emacs shell)

                 Ps = 5 2  -> Manipulate Selection Data.  These controls
               may be disabled using the allowWindowOps resource.  The
               parameter Pt is parsed as
                    Pc; Pd
               The first, Pc, may contain any character from the set c
               p  s  0  1  2  3  4  5  6  7 .  It is used to construct a
               list of selection parameters for clipboard, primary,
               select, or cut buffers 0 through 8 respectively, in the
               order given.  If the parameter is empty, xterm uses s 0 ,
               to specify the configurable primary/clipboard selection
               and cut buffer 0.
               The second parameter, Pd, gives the selection data.  Nor-
               mally this is a string encoded in base64.  The data
               becomes the new selection, which is then available for
               pasting by other applications.
               If the second parameter is a ? , xterm replies to the
               host with the selection data encoded using the same pro-
               tocol.

Privacy Message
PM Pt ST       xterm implements no PM  functions; Pt is ignored.  Pt
               need not be printable characters.

PC-Style Function Keys
If xterm does minimal translation of the function keys, it usually does
this with a PC-style keyboard, so PC-style function keys result.  Sun
keyboards are similar to PC keyboards.  Both have cursor and scrolling
operations printed on the keypad, which duplicate the smaller cursor and
scrolling keypads.
X does not predefine NumLock (used for VT220 keyboards) or Alt (used as
an extension for the Sun/PC keyboards) as modifiers.  These keys are
recognized as modifiers when enabled by the numLock resource, or by the
DECSET 1 0 3 5  control sequence.
The cursor keys transmit the following escape sequences depending on the
mode specified via the DECCKM escape sequence.

                      Key         Normal    Application
                  --------------------------------------
                  Cursor Up      CSI A      SS3 A
                  Cursor Down    CSI B      SS3 B
                  Cursor Right   CSI C      SS3 C
                  Cursor Left    CSI D      SS3 D
                  --------------------------------------

The home- and end-keys (unlike PageUp and other keys also on the 6-key
editing keypad) are considered "cursor keys" by xterm.  Their mode is
also controlled by the DECCKM escape sequence:

                      Key       Normal    Application
                    ----------------------------------
                    Home       CSI H      SS3 H
                    End        CSI F      SS3 F
                    ----------------------------------

The application keypad transmits the following escape sequences depend-
ing on the mode specified via the DECPNM and DECPAM escape sequences.
Use the NumLock key to override the application mode.
Not all keys are present on the Sun/PC keypad (e.g., PF1, Tab), but are
supported by the program.

           Key         Numeric    Application   Terminfo   Termcap
      --------------------------------------------------------------
      Space            SP         SS3 SP        -          -
      Tab              TAB        SS3 I         -          -
      Enter            CR         SS3 M         kent       @8
      PF1              SS3 P      SS3 P         kf1        k1
      PF2              SS3 Q      SS3 Q         kf2        k2
      PF3              SS3 R      SS3 R         kf3        k3
      PF4              SS3 S      SS3 S         kf4        k4
      * (multiply)     *          SS3 j         -          -
      + (add)          +          SS3 k         -          -
      , (comma)        ,          SS3 l         -          -
      - (minus)        -          SS3 m         -          -
      . (Delete)       .          CSI 3 ~       -          -
      / (divide)       /          SS3 o         -          -
      0 (Insert)       0          CSI 2 ~       -          -
      1 (End)          1          SS3 F         kc1        K4
      2 (DownArrow)    2          CSI B         -          -
      3 (PageDown)     3          CSI 6 ~       kc3        K5
      4 (LeftArrow)    4          CSI D         -          -
      5 (Begin)        5          CSI E         kb2        K2
      6 (RightArrow)   6          CSI C         -          -
      7 (Home)         7          SS3 H         ka1        K1
      8 (UpArrow)      8          CSI A         -          -
      9 (PageUp)       9          CSI 5 ~       ka3        K3
      = (equal)        =          SS3 X         -          -
      --------------------------------------------------------------

They also provide 12 function keys, as well as a few other special-pur-
pose keys.

                         Key      Escape Sequence
                       ---------------------------
                       F1         SS3 P
                       F2         SS3 Q
                       F3         SS3 R
                       F4         SS3 S
                       F5         CSI 1 5 ~
                       F6         CSI 1 7 ~
                       F7         CSI 1 8 ~
                       F8         CSI 1 9 ~
                       F9         CSI 2 0 ~
                       F10        CSI 2 1 ~
                       F11        CSI 2 3 ~
                       F12        CSI 2 4 ~
                       ---------------------------

Older versions of xterm implement different escape sequences for F1
through F4.  These can be activated by setting the oldXtermFKeys
resource.  However, since they do not correspond to any hardware termi-
nal, they have been deprecated.  (The DEC VT220 reserves F1 through F5
for local functions such as Setup).

                         Key      Escape Sequence
                       ---------------------------
                       F1         CSI 1 1 ~
                       F2         CSI 1 2 ~
                       F3         CSI 1 3 ~
                       F4         CSI 1 4 ~
                       ---------------------------

In normal mode, i.e., a Sun/PC keyboard when the sunKeyboard resource is
false, xterm recognizes function key modifiers which are parameters
appended before the final character of the control sequence.

                      Code     Modifiers
                    ---------------------------------
                       2       Shift
                       3       Alt
                       4       Shift + Alt
                       5       Control
                       6       Shift + Control
                       7       Alt + Control
                       8       Shift + Alt + Control
                    ---------------------------------

For example, shift-F5 would be sent as CSI 1 5 ; 2 ~
If the alwaysUseMods resource is set, the Meta modifier also is recog-
nized, making parameters 9 through 16.

VT220-Style Function Keys
However, xterm is most useful as a DEC VT102 or VT220 emulator.  Set the
sunKeyboard resource to true to force a Sun/PC keyboard to act like a
VT220 keyboard.

The VT102/VT220 application keypad transmits unique escape sequences in
application mode, which are distinct from the cursor and scrolling key-
pad:

                      Key        Numeric    Application
                  --------------------------------------
                  Space          SP         SS3 SP
                  Tab            TAB        SS3 I
                  Enter          CR         SS3 M
                  PF1            SS3 P      SS3 P
                  PF2            SS3 Q      SS3 Q
                  PF3            SS3 R      SS3 R
                  PF4            SS3 S      SS3 S
                  * (multiply)   *          SS3 j
                  + (add)        +          SS3 k
                  , (comma)      ,          SS3 l
                  - (minus)      -          SS3 m
                  . (period)     .          SS3 n
                  / (divide)     /          SS3 o
                  0              0          SS3 p
                  1              1          SS3 q
                  2              2          SS3 r
                  3              3          SS3 s
                  4              4          SS3 t
                  5              5          SS3 u
                  6              6          SS3 v
                  7              7          SS3 w
                  8              8          SS3 x
                  9              9          SS3 y
                  = (equal)      =          SS3 X
                  --------------------------------------

The VT220 provides a 6-key editing keypad, which is analogous to that on
the PC keyboard.  It is not affected by DECCKM or DECPNM/DECPAM:

                     Key       Normal    Application
                   ----------------------------------
                   Insert     CSI 2 ~    CSI 2 ~
                   Delete     CSI 3 ~    CSI 3 ~
                   Home       CSI 1 ~    CSI 1 ~
                   End        CSI 4 ~    CSI 4 ~
                   PageUp     CSI 5 ~    CSI 5 ~
                   PageDown   CSI 6 ~    CSI 6 ~
                   ----------------------------------

The VT220 provides 8 additional function keys.  With a Sun/PC keyboard,
access these keys by Control/F1 for F13, etc.

                         Key      Escape Sequence
                       ---------------------------
                       F13        CSI 2 5 ~
                       F14        CSI 2 6 ~
                       F15        CSI 2 8 ~
                       F16        CSI 2 9 ~
                       F17        CSI 3 1 ~
                       F18        CSI 3 2 ~
                       F19        CSI 3 3 ~
                       F20        CSI 3 4 ~
                       ---------------------------


VT52-Style Function Keys
A VT52 does not have function keys, but it does have a numeric keypad
and cursor keys.  They differ from the other emulations by the prefix.
Also, the cursor keys do not change:

                       Key        Normal/Application
                   ----------------------------------
                   Cursor Up      ESC A
                   Cursor Down    ESC B
                   Cursor Right   ESC C
                   Cursor Left    ESC D
                   ----------------------------------

The keypad is similar:

                      Key        Numeric    Application
                  --------------------------------------
                  Space          SP         ESC ? SP
                  Tab            TAB        ESC ? I
                  Enter          CR         ESC ? M
                  PF1            ESC P      ESC P
                  PF2            ESC Q      ESC Q
                  PF3            ESC R      ESC R
                  PF4            ESC S      ESC S
                  * (multiply)   *          ESC ? j
                  + (add)        +          ESC ? k
                  , (comma)      ,          ESC ? l
                  - (minus)      -          ESC ? m
                  . (period)     .          ESC ? n
                  / (divide)     /          ESC ? o
                  0              0          ESC ? p
                  1              1          ESC ? q
                  2              2          ESC ? r
                  3              3          ESC ? s
                  4              4          ESC ? t
                  5              5          ESC ? u
                  6              6          ESC ? v
                  7              7          ESC ? w
                  8              8          ESC ? x
                  9              9          ESC ? y
                  = (equal)      =          ESC ? X
                  --------------------------------------


Sun-Style Function Keys
The xterm program provides support for Sun keyboards more directly, by a
menu toggle that causes it to send Sun-style function key codes rather
than VT220.  Note, however, that the sun and VT100 emulations are not
really compatible.  For example, their wrap-margin behavior differs.
Only function keys are altered; keypad and cursor keys are the same.
The emulation responds identically.  See the xterm-sun terminfo entry
for details.

HP-Style Function Keys
Similarly, xterm can be compiled to support HP keyboards.  See the
xterm-hp terminfo entry for details.

The Alternate Screen Buffer
Xterm maintains two screen buffers.  The normal screen buffer allows you
to scroll back to view saved lines of output up to the maximum set by
the saveLines resource.  The alternate screen buffer is exactly as large
as the display, contains no additional saved lines.  When the alternate
screen buffer is active, you cannot scroll back to view saved lines.
Xterm provides control sequences and menu entries for switching between
the two.

Most full-screen applications use terminfo or termcap to obtain strings
used to start/stop full-screen mode, i.e., smcup and rmcup for terminfo,
or the corresponding ti and te for termcap.  The titeInhibit resource
removes the ti and te strings from the TERMCAP string which is set in
the environment for some platforms.  That is not done when xterm is
built with terminfo libraries because terminfo does not provide the
whole text of the termcap data in one piece.  It would not work for ter-
minfo anyway, since terminfo data is not passed in environment vari-
ables; setting an environment variable in this manner would have no
effect on the application's ability to switch between normal and alter-
nate screen buffers.  Instead, the newer private mode controls (such as
1 0 4 9 ) for switching between normal and alternate screen buffers sim-
ply disable the switching.  They add other features such as clearing the
display for the same reason: to make the details of switching indepen-
dent of the application that requests the switch.

Bracketed Paste Mode
When bracketed paste mode is set, pasted text is bracketed with control
sequences so that the program can differentiate pasted text from typed-
in text.  When bracketed paste mode is set, the program will receive:
ESC [ 200 ~, followed by the pasted text, followed by ESC [ 201 ~.

Mouse Tracking
The VT widget can be set to send the mouse position and other informa-
tion on button presses.  These modes are typically used by editors and
other full-screen applications that want to make use of the mouse.

There are six mutually exclusive modes.  One is DEC Locator mode,
enabled by the DECELR CSI Ps ; Ps  '  z control sequence, and is not
described here (control sequences are summarized above).  The remaining
five modes are each enabled (or disabled) by a different parameter in
DECSET CSI ? Pm h or DECRST CSI ? Pm l control sequence.

Manifest constants for the parameter values are defined in xcharmouse.h
as follows:

                #define SET_X10_MOUSE               9
                #define SET_VT200_MOUSE             1000
                #define SET_VT200_HIGHLIGHT_MOUSE   1001
                #define SET_BTN_EVENT_MOUSE         1002
                #define SET_ANY_EVENT_MOUSE         1003

The motion reporting modes are strictly xterm extensions, and are not
part of any standard, though they are analogous to the DEC VT200 DECELR
locator reports.

Parameters (such as pointer position and button number) for all mouse
tracking escape sequences generated by xterm encode numeric parameters
in a single character as value+32.  For example, !  specifies the value
1.  The upper left character position on the terminal is denoted as 1,1.

X10 compatibility mode sends an escape sequence only on button press,
encoding the location and the mouse button pressed.  It is enabled by
specifying parameter 9 to DECSET.  On button press, xterm sends CSI M
CbCxCy (6 characters).  Cb is button-1.  Cx and Cy are the x and y coor-
dinates of the mouse when the button was pressed.

Normal tracking mode sends an escape sequence on both button press and
release.  Modifier key (shift, ctrl, meta) information is also sent.  It
is enabled by specifying parameter 1000 to DECSET.  On button press or
release, xterm sends CSI M CbCxCy.  The low two bits of Cb encode button
information: 0=MB1 pressed, 1=MB2 pressed, 2=MB3 pressed, 3=release.
The next three bits encode the modifiers which were down when the button
was pressed and are added together:  4=Shift, 8=Meta, 16=Control.  Note
however that the shift and control bits are normally unavailable because
xterm uses the control modifier with mouse for popup menus, and the
shift modifier is used in the default translations for button events.
The Meta modifier recognized by xterm is the mod1 mask, and is not nec-
essarily the "Meta" key (see xmodmap).  Cx and Cy are the x and y coor-
dinates of the mouse event, encoded as in X10 mode.

Wheel mice may return buttons 4 and 5.  Those buttons are represented by
the same event codes as buttons 1 and 2 respectively, except that 64 is
added to the event code.  Release events for the wheel buttons are not
reported.

Mouse highlight tracking notifies a program of a button press, receives
a range of lines from the program, highlights the region covered by the
mouse within that range until button release, and then sends the program
the release coordinates.  It is enabled by specifying parameter 1001 to
DECSET.  Highlighting is performed only for button 1, though other but-
ton events can be received.  Warning: use of this mode requires a coop-
erating program or it will hang xterm.  On button press, the same infor-
mation as for normal tracking is generated; xterm then waits for the
program to send mouse tracking information.  All X events are ignored
until the proper escape sequence is received from the pty: CSI Ps ; Ps ;
Ps ; Ps ; Ps T .  The parameters are func, startx, starty, firstrow, and
lastrow.  func is non-zero to initiate highlight tracking and zero to
abort.  startx and starty give the starting x and y location for the
highlighted region.  The ending location tracks the mouse, but will
never be above row firstrow and will always be above row lastrow.  (The
top of the screen is row 1.)  When the button is released, xterm reports
the ending position one of two ways: if the start and end coordinates
are valid text locations: CSI t CxCy.  If either coordinate is past the
end of the line: CSI T CxCyCxCyCxCy.  The parameters are startx, starty,
endx, endy, mousex, and mousey.  startx, starty, endx, and endy give the
starting and ending character positions of the region.  mousex and
mousey give the location of the mouse at button up, which may not be
over a character.

Button-event tracking is essentially the same as normal tracking, but
xterm also reports button-motion events.  Motion events are reported
only if the mouse pointer has moved to a different character cell.  It
is enabled by specifying parameter 1002 to DECSET.  On button press or
release, xterm sends the same codes used by normal tracking mode.  On
button-motion events, xterm adds 32 to the event code (the third charac-
ter, Cb).  The other bits of the event code specify button and modifier
keys as in normal mode.  For example, motion into cell x,y with button 1
down is reported as CSI M @ CxCy.  ( @  = 32 + 0 (button 1) + 32 (motion
indicator) ).  Similarly, motion with button 3 down is reported as CSI M
B CxCy.  ( B  = 32 + 2 (button 3) + 32 (motion indicator) ).

Any-event mode is the same as button-event mode, except that all motion
events are reported, even if no mouse button is down.  It is enabled by
specifying 1003 to DECSET.

Tektronix 4014 Mode
Most of these sequences are standard Tektronix 4014 control sequences.
Graph mode supports the 12-bit addressing of the Tektronix 4014.  The
major features missing are the write-through and defocused modes.  This
document does not describe the commands used in the various Tektronix
plotting modes but does describe the commands to switch modes.

BEL            Bell (Ctrl-G)
BS             Backspace (Ctrl-H)
TAB            Horizontal Tab (Ctrl-I)
LF             Line Feed or New Line (Ctrl-J)
VT             Cursor up (Ctrl-K)
FF             Form Feed or New Page (Ctrl-L)
CR             Carriage Return (Ctrl-M)
ESC ETX        Switch to VT100 Mode (ESC Ctrl-C)
ESC ENQ        Return Terminal Status (ESC Ctrl-E)
ESC FF         PAGE (Clear Screen) (ESC Ctrl-L)
ESC SO         Begin 4015 APL mode (ignored by xterm) (ESC Ctrl-N)
ESC SI         End 4015 APL mode (ignored by xterm) (ESC Ctrl-O)
ESC ETB        COPY (Save Tektronix Codes to file COPYyyyy-mm-
               dd.hh:mm:ss) (ESC Ctrl-W)
ESC CAN        Bypass Condition (ESC Ctrl-X)
ESC SUB        GIN mode (ESC Ctrl-Z)
ESC FS         Special Point Plot Mode (ESC Ctrl-\)
ESC 8          Select Large Character Set
ESC 9          Select #2 Character Set
ESC :          Select #3 Character Set
ESC ;          Select Small Character Set
OSC Ps ; Pt BEL
               Set Text Parameters of VT window
                 Ps = 0  -> Change Icon Name and Window Title to Pt
                 Ps = 1  -> Change Icon Name to Pt
                 Ps = 2  -> Change Window Title to Pt
                 Ps = 4 6  -> Change Log File to Pt (normally disabled
               by a compile-time option)
ESC `          Normal Z Axis and Normal (solid) Vectors
ESC a          Normal Z Axis and Dotted Line Vectors
ESC b          Normal Z Axis and Dot-Dashed Vectors
ESC c          Normal Z Axis and Short-Dashed Vectors
ESC d          Normal Z Axis and Long-Dashed Vectors
ESC h          Defocused Z Axis and Normal (solid) Vectors
ESC i          Defocused Z Axis and Dotted Line Vectors
ESC j          Defocused Z Axis and Dot-Dashed Vectors
ESC k          Defocused Z Axis and Short-Dashed Vectors
ESC l          Defocused Z Axis and Long-Dashed Vectors
ESC p          Write-Thru Mode and Normal (solid) Vectors
ESC q          Write-Thru Mode and Dotted Line Vectors
ESC r          Write-Thru Mode and Dot-Dashed Vectors
ESC s          Write-Thru Mode and Short-Dashed Vectors
ESC t          Write-Thru Mode and Long-Dashed Vectors
FS             Point Plot Mode (Ctrl-\)
GS             Graph Mode (Ctrl-])
RS             Incremental Plot Mode (Ctrl-^)
US             Alpha Mode (Ctrl-_)

VT52 Mode
Parameters for cursor movement are at the end of the ESC Y  escape
sequence.  Each ordinate is encoded in a single character as value+32.
For example, !  is 1.  The screen coordinate system is 0-based.

ESC A          Cursor up.
ESC B          Cursor down.
ESC C          Cursor right.
ESC D          Cursor left.
ESC F          Enter graphics mode.
ESC G          Exit graphics mode.
ESC H          Move the cursor to the home position.
ESC I          Reverse line feed.
ESC J          Erase from the cursor to the end of the screen.
ESC K          Erase from the cursor to the end of the line.
ESC Y Ps Ps    Move the cursor to given row and column.
ESC Z          Identify
                 -> ESC  /  Z  (``I am a VT52.'')
ESC =          Enter alternate keypad mode.
ESC >          Exit alternate keypad mode.
ESC <          Exit VT52 mode (Enter VT100 mode).