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

[philg@zurich.ai.mit.edu (Philip Greenspun)]

The documentation for WINDOW-SHOWN-P says that it "returns true if the
window is visible , and false it is hidden".

This seems to return t for me when I give it any of the windows
returned by (WINDOWS), i.e., for any window in the system even if it
is covered by five other windows.

I can't use WINDOW-LAYER either because if I have six windows all in
different spots on a big screen, they are all visible as far as I'm
concerned yet they all report themselves as being in different layers.

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?

Thanks,



--

      -- Philip Greenspun

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