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CreateRectRgn        Creates a rectangular region

HRGN CreateRectRgn(RcUlX, RcUlY, RcLrX, RcLrY);
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 */

Returns:        Handle of new region or NULL on failure.

Note:           RcLrX - RcUlX and RcLrY - RcUlY must be less than
                32,767