HideTurtle               Makes the Turtle Invisible

 HideTurtle;                                                          [TG/TP]

    Makes the turtle invisible. The turtle can still move, draw, rotate,
    and so on, but the turtle is not visible.

           Note:    The turtle is initially invisible. To see the turtle,
                    ShowTurtle must be called first.

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

           HideTurtle;              { turtle is no longer visible }