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 RAT_AREA() Limits the mouse to a rectangular area of the
 screen

 Returns
 None

 Syntax
 RAT_AREA(nTop,nLeft,nBottom,nRight)

 Description
 Limits the mouse to a rectangular area of the screen
 determined by <nTop,nLeft,nBottom,nRight>. Mouse cannot move
 outside of these boundaries.

 Examples
  RAT_AREA(10,10,20,20) // limits the mouse to 10,10,20,20
 area

 Notes:
 Be sure to set the mouse area back to fullscreen when
 you're done.

 Source: S_MOUSE.ASM