WinValidateRegion - Parameters

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).

hrgn (HRGN) - input

Handle of subtracted region.

This is the region that is subtracted from the window's update region.

fIncludeClippedChildren (BOOL) - input

Validation-scope indicator.

TRUE

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

rc (BOOL) - returns

Success indicator.

TRUE

Successful completion
FALSE
Error occurred.

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