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The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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CS_CLIPCHILDREN  Prevents a window from painting over its child window. This
style protects child windows but increases the time necessary to calculate
the visible region. This style is normally not necessary, since if the
parent and child windows overlap and are both invalidated, the parent window
is drawn before the child window. If the child window is invalidated
independently from the parent window, only the child window is redrawn. If
the update region of the parent window does not intersect the child window,
drawing the parent window should not disturb the child window.
 
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