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use of update idle tasks to update the display
Menus example from a Well House Consultants training course
More on Menus [link]
Source code: idletasks Module: T221
#!/usr/bin/env wish
# During a long running process, there's often a need # to update the display to keep the user informed. # update idletasks is the command to use proc pingit {} { global currenthost .result config -text "running test ... please wait" update idletasks # If you comment the previous line out # the user is left wondering what is going on! catch {exec ping -c 3 $currenthost} result # Note the use of catch to recover exec results .result config -text $result } set currenthost www.wellho.net if {[llength $argv] > 0} {set currenthost [lindex $argv 0]} button .go -text "Check status $currenthost" -command pingit button .exit -text exit -command exit label .result -width 60 -height 10 -text "Result Window" pack .go .result .exit -fill both -expand true Learn about this subject
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