TurtleThere              Indicates If the Turtle Is Currently Visible

 TurtleThere : Boolean;                                               [TG/TP]

    Returns TRUE if the turtle is visible; otherwise, returns FALSE. The
    turtle is visible if ShowTurtle has been called and the turtle is in
    the current window.

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

           if not TurtleThere then begin    { If turtle not visible, then }
             Home;                          { Put turtle in center of     }
             ShowTurtle                     { window and display turtle   }
           end;