21- CONTROLLER RETURN                                ESC [ 21 ; c ; x ; y !

    (This is SENT from the terminal every time a controller is activated -
    c=1 for left button mouse click at coord. x,y ;
    c=2 for menu selection [x is the menu item #, y is ignored])

    SPINY'S NOTE: Due to a bug in JR-COMM 1.02 (which was fixed in 1.02a),
    the ESC code is not sent with this command.  This should be taken into
    consideration when adding mouse control to your own applications.

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