$FUNCNAME$
  MSETBOUNDS()
$CATEGORY$
  KEYBOARD/MOUSE
$SUMMARY$
   Set screen boundaries for the mouse cursor
$SYNTAX$
     MSETBOUNDS( [<nTop>], [<nLeft>], [<nBottom>], [<nRight>] ) --> NIL
$ARGUMENTS$
     <nTop> defines the uppermost allowable screen row for the mouse
     cursor or 0 if omitted.  This value may range from 0 to the value of
     <nBottom>.

     <nLeft> defines the leftmost allowable screen column for the mouse
     or 0 if omitted.  This value may range from 0 to the value of <nRight>.

     <nBottom> defines the bottommost screen row for the mouse cursor or
     MaxRow() if omitted.  This value may range from the value of <nTop> to
     MaxRow().

     <nRight> defines the rightmost allowable screen column for the mouse
     or MaxCol() if omitted.  This value may range from the value of <nLeft>
     to MaxCol().
$RETURNS$
     MSETBOUNDS() always returns NIL.
$SEEALSO$

$END$
