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                               msm_condoff

   Usage
   #include <msmouse.h>
   void   msm_condoff(unsigned   upperx,   unsigned   uppery,    unsigned
   lowerx,unsigned lowery);

   Description
   Conditional  off.  The parameters define a rectangular region  on  the
   screen. When the mouse is in that region, the mouse cursor is  hidden.
   This is useful if a portion of the screen is to be updated. A call  to
   msm_showcursor() will undo this and turn the mouse cursor back on.