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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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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WS_CLIPCHILDREN  Prevents a window from painting over its child windows.
This style protects child windows but increases the time necessary to
calculate the visible region. This style is usually not necessary, since if
the parent and child windows overlap and are both invalidated, the system
draws the parent window before drawing the child window. If the child window
is invalidated independent of the parent window, the system redraws only the
child window. 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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