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Re: do I need a college education to understand WINDOW-SHOWN-P?

 >From: philg@zurich.ai.mit.edu (Philip Greenspun)
 >Is there an easy way to determine if part or all of a window is in
 >fact visible to a user?  And what is the purpose of WINDOW-SHOWN-P?

Check if the window's visible region's height and width are zero?
I haven't tried this myself.