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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