Microsoft Windows-specific (but KDE has one, too?) GUI construct in the lower right-hand corner, not the taskbar, that ... (RS adds:) holds little icons with mouse-over balloon behavior, and on double-click bring up minimized windows. Typically there are at least speaker volume control and clock; the Task manager also makes a tray icon that indicates CPU usage.
winico or Win32api are necessary to manage the system tray.
Tom Wilkason posted to the comp.lang.tcl newsgroup: "Here is an example from an http server that hides itself in the taskbar ...
;##
;# Callback to handle taskbar icon events
;#
proc ht:iconCallback { message ico wparam lparam x y } {
switch -- $message {
WM_LBUTTONDOWN {
wm deiconify .
}
WM_RBUTTONDOWN {
wm withdraw .
}
default {}
} ;# End Switch
}
;##
;# Make window dissapear when it is minimized
;#
if {[catch {
package require WinIcoUtils
if {[winico info] == ""} {
;# Let GUI settle before setting icon
update
set ico [winico_seticon . [file join $home .. bin tclhttp.ico]]
winico text $ico {tchHttp Web Server}
winico taskbar add $ico -callback [list ht:iconCallback %m %i %w %l %x
%y]
proc Minimize {w} {
wm withdraw .
console hide
}
} ;# end if
} result]} {
console show
puts stderr "$result"
} else {
wm withdraw .
}