The coordinate values are dependent on the display mode. Pel values must be used if the display is in graphics mode. Character position values must be used if the display is in text mode.

This function does not override MOU_UNMARKCOLLISIONAREA or MOU_MARKCOLLISIONAREA as it has no effect on current restricted areas of the screen. If the pointer is directed into a restricted area (collision area), it remains invisible until moved out of the area or until the restrictions are removed.