man/mann/tk.n - toolchains/skids - Git at Google

 '\"
 '\" Copyright (c) 1992 The Regents of the University of California.
 '\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
 '\"
 '\" See the file "license.terms" for information on usage and redistribution
 '\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 '\"
 '\" RCS: @(#) $Id: tk.n,v 1.7 2002/09/02 22:00:37 hobbs Exp $
 '\"
 '\" The definitions below are for supplemental macros used in Tcl/Tk
 '\" manual entries.
 '\"
 '\" .AP type name in/out ?indent?
 '\"	Start paragraph describing an argument to a library procedure.
 '\"	type is type of argument (int, etc.), in/out is either "in", "out",
 '\"	or "in/out" to describe whether procedure reads or modifies arg,
 '\"	and indent is equivalent to second arg of .IP (shouldn't ever be
 '\"	needed;  use .AS below instead)
 '\"
 '\" .AS ?type? ?name?
 '\"	Give maximum sizes of arguments for setting tab stops.  Type and
 '\"	name are examples of largest possible arguments that will be passed
 '\"	to .AP later.  If args are omitted, default tab stops are used.
 '\"
 '\" .BS
 '\"	Start box enclosure.  From here until next .BE, everything will be
 '\"	enclosed in one large box.
 '\"
 '\" .BE
 '\"	End of box enclosure.
 '\"
 '\" .CS
 '\"	Begin code excerpt.
 '\"
 '\" .CE
 '\"	End code excerpt.
 '\"
 '\" .VS ?version? ?br?
 '\"	Begin vertical sidebar, for use in marking newly-changed parts
 '\"	of man pages.  The first argument is ignored and used for recording
 '\"	the version when the .VS was added, so that the sidebars can be
 '\"	found and removed when they reach a certain age.  If another argument
 '\"	is present, then a line break is forced before starting the sidebar.
 '\"
 '\" .VE
 '\"	End of vertical sidebar.
 '\"
 '\" .DS
 '\"	Begin an indented unfilled display.
 '\"
 '\" .DE
 '\"	End of indented unfilled display.
 '\"
 '\" .SO
 '\"	Start of list of standard options for a Tk widget.  The
 '\"	options follow on successive lines, in four columns separated
 '\"	by tabs.
 '\"
 '\" .SE
 '\"	End of list of standard options for a Tk widget.
 '\"
 '\" .OP cmdName dbName dbClass
 '\"	Start of description of a specific option.  cmdName gives the
 '\"	option's name as specified in the class command, dbName gives
 '\"	the option's name in the option database, and dbClass gives
 '\"	the option's class in the option database.
 '\"
 '\" .UL arg1 arg2
 '\"	Print arg1 underlined, then print arg2 normally.
 '\"
 '\" RCS: @(#) $Id: man.macros,v 1.4 2000/08/25 06:18:32 ericm Exp $
 '\"
 '\"	# Set up traps and other miscellaneous stuff for Tcl/Tk man pages.
 .if t .wh -1.3i ^B
 .nr ^l \n(.l
 .ad b
 '\"	# Start an argument description
 .de AP
 .ie !"\\$4"" .TP \\$4
 .el \{\
 .   ie !"\\$2"" .TP \\n()Cu
 .   el          .TP 15
 .\}
 .ta \\n()Au \\n()Bu
 .ie !"\\$3"" \{\
 \&\\$1	\\fI\\$2\\fP	(\\$3)
 .\".b
 .\}
 .el \{\
 .br
 .ie !"\\$2"" \{\
 \&\\$1	\\fI\\$2\\fP
 .\}
 .el \{\
 \&\\fI\\$1\\fP
 .\}
 .\}
 ..
 '\"	# define tabbing values for .AP
 .de AS
 .nr )A 10n
 .if !"\\$1"" .nr )A \\w'\\$1'u+3n
 .nr )B \\n()Au+15n
 .\"
 .if !"\\$2"" .nr )B \\w'\\$2'u+\\n()Au+3n
 .nr )C \\n()Bu+\\w'(in/out)'u+2n
 ..
 .AS Tcl_Interp Tcl_CreateInterp in/out
 '\"	# BS - start boxed text
 '\"	# ^y = starting y location
 '\"	# ^b = 1
 .de BS
 .br
 .mk ^y
 .nr ^b 1u
 .if n .nf
 .if n .ti 0
 .if n \l'\\n(.lu\(ul'
 .if n .fi
 ..
 '\"	# BE - end boxed text (draw box now)
 .de BE
 .nf
 .ti 0
 .mk ^t
 .ie n \l'\\n(^lu\(ul'
 .el \{\
 .\"	Draw four-sided box normally, but don't draw top of
 .\"	box if the box started on an earlier page.
 .ie !\\n(^b-1 \{\
 \h'-1.5n'\L'|\\n(^yu-1v'\l'\\n(^lu+3n\(ul'\L'\\n(^tu+1v-\\n(^yu'\l'|0u-1.5n\(ul'
 .\}
 .el \}\
 \h'-1.5n'\L'|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\l'|0u-1.5n\(ul'
 .\}
 .\}
 .fi
 .br
 .nr ^b 0
 ..
 '\"	# VS - start vertical sidebar
 '\"	# ^Y = starting y location
 '\"	# ^v = 1 (for troff;  for nroff this doesn't matter)
 .de VS
 .if !"\\$2"" .br
 .mk ^Y
 .ie n 'mc \s12\(br\s0
 .el .nr ^v 1u
 ..
 '\"	# VE - end of vertical sidebar
 .de VE
 .ie n 'mc
 .el \{\
 .ev 2
 .nf
 .ti 0
 .mk ^t
 \h'|\\n(^lu+3n'\L'|\\n(^Yu-1v\(bv'\v'\\n(^tu+1v-\\n(^Yu'\h'-|\\n(^lu+3n'
 .sp -1
 .fi
 .ev
 .\}
 .nr ^v 0
 ..
 '\"	# Special macro to handle page bottom:  finish off current
 '\"	# box/sidebar if in box/sidebar mode, then invoked standard
 '\"	# page bottom macro.
 .de ^B
 .ev 2
 'ti 0
 'nf
 .mk ^t
 .if \\n(^b \{\
 .\"	Draw three-sided box if this is the box's first page,
 .\"	draw two sides but no top otherwise.
 .ie !\\n(^b-1 \h'-1.5n'\L'|\\n(^yu-1v'\l'\\n(^lu+3n\(ul'\L'\\n(^tu+1v-\\n(^yu'\h'|0u'\c
 .el \h'-1.5n'\L'|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\h'|0u'\c
 .\}
 .if \\n(^v \{\
 .nr ^x \\n(^tu+1v-\\n(^Yu
 \kx\h'-\\nxu'\h'|\\n(^lu+3n'\ky\L'-\\n(^xu'\v'\\n(^xu'\h'|0u'\c
 .\}
 .bp
 'fi
 .ev
 .if \\n(^b \{\
 .mk ^y
 .nr ^b 2
 .\}
 .if \\n(^v \{\
 .mk ^Y
 .\}
 ..
 '\"	# DS - begin display
 .de DS
 .RS
 .nf
 .sp
 ..
 '\"	# DE - end display
 .de DE
 .fi
 .RE
 .sp
 ..
 '\"	# SO - start of list of standard options
 .de SO
 .SH "STANDARD OPTIONS"
 .LP
 .nf
 .ta 5.5c 11c
 .ft B
 ..
 '\"	# SE - end of list of standard options
 .de SE
 .fi
 .ft R
 .LP
 See the \\fBoptions\\fR manual entry for details on the standard options.
 ..
 '\"	# OP - start of full description for a single option
 .de OP
 .LP
 .nf
 .ta 4c
 Command-Line Name:	\\fB\\$1\\fR
 Database Name:	\\fB\\$2\\fR
 Database Class:	\\fB\\$3\\fR
 .fi
 .IP
 ..
 '\"	# CS - begin code excerpt
 .de CS
 .RS
 .nf
 .ta .25i .5i .75i 1i
 ..
 '\"	# CE - end code excerpt
 .de CE
 .fi
 .RE
 ..
 .de UL
 \\$1\l'|0\(ul'\\$2
 ..
 .TH tk n 8.4 Tk "Tk Built-In Commands"
 .BS
 '\" Note:  do not modify the .SH NAME line immediately below!
 .SH NAME
 tk \- Manipulate Tk internal state
 .SH SYNOPSIS
 \fBtk\fR \fIoption \fR?\fIarg arg ...\fR?
 .BE

 .SH DESCRIPTION
 .PP
 The \fBtk\fR command provides access to miscellaneous
 elements of Tk's internal state.
 Most of the information manipulated by this command pertains to the
 application as a whole, or to a screen or display, rather than to a
 particular window.
 The command can take any of a number of different forms
 depending on the \fIoption\fR argument.  The legal forms are:
 .TP
 \fBtk appname \fR?\fInewName\fR?
 If \fInewName\fR isn't specified, this command returns the name
 of the application (the name that may be used in \fBsend\fR
 commands to communicate with the application).
 If \fInewName\fR is specified, then the name of the application
 is changed to \fInewName\fR.
 If the given name is already in use, then a suffix of the form
 ``\fB #2\fR'' or ``\fB #3\fR'' is appended in order to make the name unique.
 The command's result is the name actually chosen.
 \fInewName\fR should not start with a capital letter.
 This will interfere with option processing, since names starting with
 capitals are assumed to be classes;  as a result, Tk may not
 be able to find some options for the application.
 If sends have been disabled by deleting the \fBsend\fR command,
 this command will reenable them and recreate the \fBsend\fR
 command.
 .VS 8.4
 .TP
 \fBtk caret window \fR?\fB\-x \fIx\fR? ?\fB\-y \fIy\fR? ?\fB\-height \fIheight\fR?
 .
 Sets and queries the caret location for the display of the specified
 Tk window \fIwindow\fR.  The caret is the per-display cursor location
 used for indicating global focus (e.g. to comply with Microsoft
 Accessibility guidelines), as well as for location of the over-the-spot
 XIM (X Input Methods) or Windows IME windows.  If no options are specified,
 the last values used for setting the caret are return in option-value pair
 format.  \fI\-x\fR and \fI\-y\fR represent window-relative coordinates, and
 \fI\-height\fR is the height of the current cursor location, or the height
 of the specified \fIwindow\fR if none is given.
 .VE
 .TP
 \fBtk scaling \fR?\fB\-displayof \fIwindow\fR? ?\fInumber\fR?
 .
 Sets and queries the current scaling factor used by Tk to convert between
 physical units (for example, points, inches, or millimeters) and pixels.  The
 \fInumber\fR argument is a floating point number that specifies the number of
 pixels per point on \fIwindow\fR's display.  If the \fIwindow\fR argument is
 omitted, it defaults to the main window.  If the \fInumber\fR argument is
 omitted, the current value of the scaling factor is returned.
 .RS
 .PP
 A ``point'' is a unit of measurement equal to 1/72 inch.  A scaling factor
 of 1.0 corresponds to 1 pixel per point, which is equivalent to a standard
 72 dpi monitor.  A scaling factor of 1.25 would mean 1.25 pixels per point,
 which is the setting for a 90 dpi monitor; setting the scaling factor to
 1.25 on a 72 dpi monitor would cause everything in the application to be
 displayed 1.25 times as large as normal.  The initial value for the scaling
 factor is set when the application starts, based on properties of the
 installed monitor, but it can be changed at any time.  Measurements made
 after the scaling factor is changed will use the new scaling factor, but it
 is undefined whether existing widgets will resize themselves dynamically to
 accomodate the new scaling factor.
 .RE
 .VS 8.3
 .TP
 \fBtk useinputmethods \fR?\fB\-displayof \fIwindow\fR? ?\fIboolean\fR?
 .
 Sets and queries the state of whether Tk should use XIM (X Input Methods)
 for filtering events.  The resulting state is returned.  XIM is used in
 some locales (ie: Japanese, Korean), to handle special input devices.  This
 feature is only significant on X.  If XIM support is not available, this
 will always return 0.  If the \fIwindow\fR argument is omitted, it defaults
 to the main window.  If the \fIboolean\fR argument is omitted, the current
 state is returned.  This is turned on by default for the main display.
 .VE
 .VS 8.4
 .TP
 \fBtk windowingsystem\fR
 .
 Returns the current Tk windowing system, one of
 \fBx11\fR (X11-based), \fBwin32\fR (MS Windows),
 \fBclassic\fR (Mac OS Classic), or \fBaqua\fR (Mac OS X Aqua).
 .VE
 .SH KEYWORDS
 application name, send
	'\"
	'\" Copyright (c) 1992 The Regents of the University of California.
	'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
	'\"
	'\" See the file "license.terms" for information on usage and redistribution
	'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
	'\"
	'\" RCS: @(#) $Id: tk.n,v 1.7 2002/09/02 22:00:37 hobbs Exp $
	'\"
	'\" The definitions below are for supplemental macros used in Tcl/Tk
	'\" manual entries.
	'\"
	'\" .AP type name in/out ?indent?
	'\" Start paragraph describing an argument to a library procedure.
	'\" type is type of argument (int, etc.), in/out is either "in", "out",
	'\" or "in/out" to describe whether procedure reads or modifies arg,
	'\" and indent is equivalent to second arg of .IP (shouldn't ever be
	'\" needed; use .AS below instead)
	'\"
	'\" .AS ?type? ?name?
	'\" Give maximum sizes of arguments for setting tab stops. Type and
	'\" name are examples of largest possible arguments that will be passed
	'\" to .AP later. If args are omitted, default tab stops are used.
	'\"
	'\" .BS
	'\" Start box enclosure. From here until next .BE, everything will be
	'\" enclosed in one large box.
	'\"
	'\" .BE
	'\" End of box enclosure.
	'\"
	'\" .CS
	'\" Begin code excerpt.
	'\"
	'\" .CE
	'\" End code excerpt.
	'\"
	'\" .VS ?version? ?br?
	'\" Begin vertical sidebar, for use in marking newly-changed parts
	'\" of man pages. The first argument is ignored and used for recording
	'\" the version when the .VS was added, so that the sidebars can be
	'\" found and removed when they reach a certain age. If another argument
	'\" is present, then a line break is forced before starting the sidebar.
	'\"
	'\" .VE
	'\" End of vertical sidebar.
	'\"
	'\" .DS
	'\" Begin an indented unfilled display.
	'\"
	'\" .DE
	'\" End of indented unfilled display.
	'\"
	'\" .SO
	'\" Start of list of standard options for a Tk widget. The
	'\" options follow on successive lines, in four columns separated
	'\" by tabs.
	'\"
	'\" .SE
	'\" End of list of standard options for a Tk widget.
	'\"
	'\" .OP cmdName dbName dbClass
	'\" Start of description of a specific option. cmdName gives the
	'\" option's name as specified in the class command, dbName gives
	'\" the option's name in the option database, and dbClass gives
	'\" the option's class in the option database.
	'\"
	'\" .UL arg1 arg2
	'\" Print arg1 underlined, then print arg2 normally.
	'\"
	'\" RCS: @(#) $Id: man.macros,v 1.4 2000/08/25 06:18:32 ericm Exp $
	'\"
	'\" # Set up traps and other miscellaneous stuff for Tcl/Tk man pages.
	.if t .wh -1.3i ^B
	.nr ^l \n(.l
	.ad b
	'\" # Start an argument description
	.de AP
	.ie !"\\$4"" .TP \\$4
	.el \{\
	. ie !"\\$2"" .TP \\n()Cu
	. el .TP 15
	.\}
	.ta \\n()Au \\n()Bu
	.ie !"\\$3"" \{\
	\&\\$1 \\fI\\$2\\fP (\\$3)
	.\".b
	.\}
	.el \{\
	.br
	.ie !"\\$2"" \{\
	\&\\$1 \\fI\\$2\\fP
	.\}
	.el \{\
	\&\\fI\\$1\\fP
	.\}
	.\}
	..
	'\" # define tabbing values for .AP
	.de AS
	.nr )A 10n
	.if !"\\$1"" .nr )A \\w'\\$1'u+3n
	.nr )B \\n()Au+15n
	.\"
	.if !"\\$2"" .nr )B \\w'\\$2'u+\\n()Au+3n
	.nr )C \\n()Bu+\\w'(in/out)'u+2n
	..
	.AS Tcl_Interp Tcl_CreateInterp in/out
	'\" # BS - start boxed text
	'\" # ^y = starting y location
	'\" # ^b = 1
	.de BS
	.br
	.mk ^y
	.nr ^b 1u
	.if n .nf
	.if n .ti 0
	.if n \l'\\n(.lu\(ul'
	.if n .fi
	..
	'\" # BE - end boxed text (draw box now)
	.de BE
	.nf
	.ti 0
	.mk ^t
	.ie n \l'\\n(^lu\(ul'
	.el \{\
	.\" Draw four-sided box normally, but don't draw top of
	.\" box if the box started on an earlier page.
	.ie !\\n(^b-1 \{\
	\h'-1.5n'\L'\|\\n(^yu-1v'\l'\\n(^lu+3n\(ul'\L'\\n(^tu+1v-\\n(^yu'\l'\|0u-1.5n\(ul'
	.\}
	.el \}\
	\h'-1.5n'\L'\|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\l'\|0u-1.5n\(ul'
	.\}
	.\}
	.fi
	.br
	.nr ^b 0
	..
	'\" # VS - start vertical sidebar
	'\" # ^Y = starting y location
	'\" # ^v = 1 (for troff; for nroff this doesn't matter)
	.de VS
	.if !"\\$2"" .br
	.mk ^Y
	.ie n 'mc \s12\(br\s0
	.el .nr ^v 1u
	..
	'\" # VE - end of vertical sidebar
	.de VE
	.ie n 'mc
	.el \{\
	.ev 2
	.nf
	.ti 0
	.mk ^t
	\h'\|\\n(^lu+3n'\L'\|\\n(^Yu-1v\(bv'\v'\\n(^tu+1v-\\n(^Yu'\h'-\|\\n(^lu+3n'
	.sp -1
	.fi
	.ev
	.\}
	.nr ^v 0
	..
	'\" # Special macro to handle page bottom: finish off current
	'\" # box/sidebar if in box/sidebar mode, then invoked standard
	'\" # page bottom macro.
	.de ^B
	.ev 2
	'ti 0
	'nf
	.mk ^t
	.if \\n(^b \{\
	.\" Draw three-sided box if this is the box's first page,
	.\" draw two sides but no top otherwise.
	.ie !\\n(^b-1 \h'-1.5n'\L'\|\\n(^yu-1v'\l'\\n(^lu+3n\(ul'\L'\\n(^tu+1v-\\n(^yu'\h'\|0u'\c
	.el \h'-1.5n'\L'\|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\h'\|0u'\c
	.\}
	.if \\n(^v \{\
	.nr ^x \\n(^tu+1v-\\n(^Yu
	\kx\h'-\\nxu'\h'\|\\n(^lu+3n'\ky\L'-\\n(^xu'\v'\\n(^xu'\h'\|0u'\c
	.\}
	.bp
	'fi
	.ev
	.if \\n(^b \{\
	.mk ^y
	.nr ^b 2
	.\}
	.if \\n(^v \{\
	.mk ^Y
	.\}
	..
	'\" # DS - begin display
	.de DS
	.RS
	.nf
	.sp
	..
	'\" # DE - end display
	.de DE
	.fi
	.RE
	.sp
	..
	'\" # SO - start of list of standard options
	.de SO
	.SH "STANDARD OPTIONS"
	.LP
	.nf
	.ta 5.5c 11c
	.ft B
	..
	'\" # SE - end of list of standard options
	.de SE
	.fi
	.ft R
	.LP
	See the \\fBoptions\\fR manual entry for details on the standard options.
	..
	'\" # OP - start of full description for a single option
	.de OP
	.LP
	.nf
	.ta 4c
	Command-Line Name: \\fB\\$1\\fR
	Database Name: \\fB\\$2\\fR
	Database Class: \\fB\\$3\\fR
	.fi
	.IP
	..
	'\" # CS - begin code excerpt
	.de CS
	.RS
	.nf
	.ta .25i .5i .75i 1i
	..
	'\" # CE - end code excerpt
	.de CE
	.fi
	.RE
	..
	.de UL
	\\$1\l'\|0\(ul'\\$2
	..
	.TH tk n 8.4 Tk "Tk Built-In Commands"
	.BS
	'\" Note: do not modify the .SH NAME line immediately below!
	.SH NAME
	tk \- Manipulate Tk internal state
	.SH SYNOPSIS
	\fBtk\fR \fIoption \fR?\fIarg arg ...\fR?
	.BE

	.SH DESCRIPTION
	.PP
	The \fBtk\fR command provides access to miscellaneous
	elements of Tk's internal state.
	Most of the information manipulated by this command pertains to the
	application as a whole, or to a screen or display, rather than to a
	particular window.
	The command can take any of a number of different forms
	depending on the \fIoption\fR argument. The legal forms are:
	.TP
	\fBtk appname \fR?\fInewName\fR?
	If \fInewName\fR isn't specified, this command returns the name
	of the application (the name that may be used in \fBsend\fR
	commands to communicate with the application).
	If \fInewName\fR is specified, then the name of the application
	is changed to \fInewName\fR.
	If the given name is already in use, then a suffix of the form
	``\fB #2\fR'' or ``\fB #3\fR'' is appended in order to make the name unique.
	The command's result is the name actually chosen.
	\fInewName\fR should not start with a capital letter.
	This will interfere with option processing, since names starting with
	capitals are assumed to be classes; as a result, Tk may not
	be able to find some options for the application.
	If sends have been disabled by deleting the \fBsend\fR command,
	this command will reenable them and recreate the \fBsend\fR
	command.
	.VS 8.4
	.TP
	\fBtk caret window \fR?\fB\-x \fIx\fR? ?\fB\-y \fIy\fR? ?\fB\-height \fIheight\fR?
	.
	Sets and queries the caret location for the display of the specified
	Tk window \fIwindow\fR. The caret is the per-display cursor location
	used for indicating global focus (e.g. to comply with Microsoft
	Accessibility guidelines), as well as for location of the over-the-spot
	XIM (X Input Methods) or Windows IME windows. If no options are specified,
	the last values used for setting the caret are return in option-value pair
	format. \fI\-x\fR and \fI\-y\fR represent window-relative coordinates, and
	\fI\-height\fR is the height of the current cursor location, or the height
	of the specified \fIwindow\fR if none is given.
	.VE
	.TP
	\fBtk scaling \fR?\fB\-displayof \fIwindow\fR? ?\fInumber\fR?
	.
	Sets and queries the current scaling factor used by Tk to convert between
	physical units (for example, points, inches, or millimeters) and pixels. The
	\fInumber\fR argument is a floating point number that specifies the number of
	pixels per point on \fIwindow\fR's display. If the \fIwindow\fR argument is
	omitted, it defaults to the main window. If the \fInumber\fR argument is
	omitted, the current value of the scaling factor is returned.
	.RS
	.PP
	A ``point'' is a unit of measurement equal to 1/72 inch. A scaling factor
	of 1.0 corresponds to 1 pixel per point, which is equivalent to a standard
	72 dpi monitor. A scaling factor of 1.25 would mean 1.25 pixels per point,
	which is the setting for a 90 dpi monitor; setting the scaling factor to
	1.25 on a 72 dpi monitor would cause everything in the application to be
	displayed 1.25 times as large as normal. The initial value for the scaling
	factor is set when the application starts, based on properties of the
	installed monitor, but it can be changed at any time. Measurements made
	after the scaling factor is changed will use the new scaling factor, but it
	is undefined whether existing widgets will resize themselves dynamically to
	accomodate the new scaling factor.
	.RE
	.VS 8.3
	.TP
	\fBtk useinputmethods \fR?\fB\-displayof \fIwindow\fR? ?\fIboolean\fR?
	.
	Sets and queries the state of whether Tk should use XIM (X Input Methods)
	for filtering events. The resulting state is returned. XIM is used in
	some locales (ie: Japanese, Korean), to handle special input devices. This
	feature is only significant on X. If XIM support is not available, this
	will always return 0. If the \fIwindow\fR argument is omitted, it defaults
	to the main window. If the \fIboolean\fR argument is omitted, the current
	state is returned. This is turned on by default for the main display.
	.VE
	.VS 8.4
	.TP
	\fBtk windowingsystem\fR
	.
	Returns the current Tk windowing system, one of
	\fBx11\fR (X11-based), \fBwin32\fR (MS Windows),
	\fBclassic\fR (Mac OS Classic), or \fBaqua\fR (Mac OS X Aqua).
	.VE
	.SH KEYWORDS
	application name, send