C++ Windows Overlapping....

How can I tell whether or not some other random window is blocking part of mine?  This is needed so I can redraw my window when it, or part of it, is again visible.  You know what I am trying to say....
jarnjarAsked:
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brettmjohnsonCommented:
This depends upon the operating system and window server you are programming to.
For instance, in my preferred development environments (NeXTstep, OpenStep, Mac OS X)
you would register a delegate of the Window that implements the windowDidExpose: and
windowDidResize: methods.

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jarnjarAuthor Commented:
This is a windows program.
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cookreCommented:
Uh, in MS Windows, after you've created your window and painted it, you'll get a WM_PAINT message whenever someone has stepped on you thereby requiring you to re-paint all or some portion of the window.
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cookreCommented:
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