INT 33 - Genius MOUSE - DEFINE SCREEN REGION FOR UPDATING
        AX = 0010h
        ES:DX -> update region list (see below)
Notes:  mouse cursor is hidden in the specified region, and needs to be
          explicitly turned on again
        this version of the call is described in an August 1988 version of the
          Genius Mouse programmer's reference; it has been changed to conform
          to the Microsoft version shown above by version 9.06 (and possibly
          earlier versions)
SeeAlso: AX=0001h,AX=0002h,AX=0007h,AX=0010h"MS MOUSE"

Format of update region list:
Offset  Size    Description
 00h    WORD    left-most column
 02h    WORD    top-most row
 04h    WORD    right-most column
 06h    WORD    bottom-most row

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