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RedHat 9 (Linux i386) - man page for tkwait (redhat section n)

tkwait(n)			       Tk Built-In Commands				tkwait(n)

_________________________________________________________________________________________________

NAME
       tkwait - Wait for variable to change or window to be destroyed

SYNOPSIS
       tkwait variable name

       tkwait visibility name

       tkwait window name
_________________________________________________________________

DESCRIPTION
       The tkwait command waits for one of several things to happen, then it returns without tak-
       ing any other actions.  The return value is always an empty string.  If the first argument
       is  variable  (or any abbreviation of it) then the second argument is the name of a global
       variable and the command waits for that variable to be modified.  If the first argument is
       visibility  (or	any  abbreviation of it) then the second argument is the name of a window
       and the tkwait command waits for a change in its visibility state  (as  indicated  by  the
       arrival	of  a  VisibilityNotify event).  This form is typically used to wait for a newly-
       created window to appear on the screen before taking some action.  If the  first  argument
       is window (or any abbreviation of it) then the second argument is the name of a window and
       the tkwait command waits for that window to be destroyed.  This form is typically used  to
       wait  for  a  user to finish interacting with a dialog box before using the result of that
       interaction.

       While the tkwait command is waiting it processes events in  the	normal	fashion,  so  the
       application  will  continue  to respond to user interactions.  If an event handler invokes
       tkwait again, the nested call to tkwait must complete before the outer call can complete.

KEYWORDS
       variable, visibility, wait, window

Tk											tkwait(n)


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