ClearScreen              Clears Graphics Window and Home Turtle

 ClearScreen;                                                         [TG/TP]

    Clears the active graphics window and homes the turtle.

          Notes:    The extended graphics external declaration file
                    GRAPH.P must be included to use this procedure.

                    The video display must be in graphics mode before this
                    procedure is called.

                    This procedure can be used just to clear the active
                    graphics window, even if turtle graphics are not being
                    used.

  -------------------------------- Example ---------------------------------

           {$I GRAPH.P }

           GraphMode;               { Put into graphics mode }
           ClearScreen;             { clears current window }