hwnd (HWND) - input

Handle of window whose update region is changed.

If this parameter is HWND_DESKTOP or a desktop-window handle, the function applies to the whole screen (or desktop).

prclRect (PRECTL) - input

Rectangle to be subtracted from the window's update region.

Note: The value of each field in this structure must be in the range -32 768 through 32 767. The data type WRECT may also be used, if supported by the language.

fIncludeClippedChildren (BOOL) - input

Validation-scope indicator.

TRUE

Include descendants of hwnd in the valid rectangle
FALSE
Include descendants of hwnd in the valid rectangle, only if parent is not WS_CLIPCHILDREN.

rc (BOOL) - returns

Success indicator.

TRUE

Successful completion
FALSE
Error occurred.

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