DEFINITION MODULE Window ;
EXPORT QUALIFIED ClipPoint, Clip ;
PROCEDURE ClipPoint (VAR x, y: CARDINAL ; Sx, Sy: CARDINAL ; VAR ok: BOOLEAN) ;
PROCEDURE Clip (VAR x1,y1,x2,y2: CARDINAL ;
                          Sx,Sy: CARDINAL ;
                         VAR ok: BOOLEAN) ;
END Window.