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SetRectRgn           Create Rectangular Region

void SetRectRgn(hRgn, RcUlX, RcUlY, RcLrX, RcLrY)
HANDLE hRgn;
short RcUlX; /* Rectangle upper left X coordinate */
short RcUlY; /* Rectangle upper left Y coordinate */
short RcLrX; /* Rectangle lower right X coordinate */
short RcLrY; /* Rectangle lower right Y coordinate */


Note:           Unlike CreateRectRgn uses space allocated for
                the regions associated with hRgn;