rSetArea()

         Indicates the zone where the mouse is active

    Syntax:

         rSetArea( nY1, nX1, nY2, nX2 ) -> Nil

         nY1 : Initial Y coordinate
         nX1 : Initial X coordinate
         nY2 : Final Y coordinate
         nX2 : Final X coordinate

    Description:

         Indicates the zone where the mouse is to be active.  The system
         won't allow the pointer to move out of this zone.

    Return:

         Nothing.

    Example:

         rSetArea ( 12, 20, 15, 60 )