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.

      pwrc (PRECTL) - input

        Update rectangle.

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

        NULL

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