hwnd (HWND) - input

Handle of window whose update region is to be changed.

HWND_DESKTOP

This function applies to the whole screen (or desktop).
Other
Handle of window whose update region is to be changed.

hrgn (HRGN) - input

Handle of the region to be added to the update region of the window.

NULLHANDLE

The whole window is to be added into the window's update region.
Other
Handle of the region to be added to the window's update region.

fIncludeChildren (BOOL) - input

Invalidation-scope indicator.

TRUE

Include the descendants of hwnd in the invalid rectangle.
FALSE
Include the descendants of hwnd in the invalid rectangle, but only if the parent does not have a WS_CLIPCHILDREN style.

rc (BOOL) - returns

Success indicator.

TRUE

Successful completion
FALSE
Error occurred.

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