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 Enables, disables, or suspends event trapping of a key; not available when
 forms are showing; cannot be used with object-specific events.
 
    KEY(n%) {ON | OFF | STOP}
 
    ■ n%    Value that specifies a function key, arrow key, or user-
            defined key:
 
            Value     Description
            ══════    ══════════════════════════════════════════════════════
            0         All keys listed (KEY(0) ON, KEY(0) OFF, and KEY(0)
                      STOP only)
            1-10      Function keys F1 - F10
            11        Up arrow key
            12        Left arrow key
            13        Right arrow key
            14        Down arrow key
            15-25     User-defined keys
            30, 31    Function keys F11 and F12
 
    ■ ON    Enables event trapping
 
    ■ OFF   Disables event trapping; if an event takes place, it is ignored
 
    ■ STOP  Suspends event trapping; any events that occur are remembered
            and processed as soon as a KEY ON statement is executed
 
 See Also
    ◄Declaring User-Defined Keys►      ◄Error/Event Trapping Summary►
    ◄KEY Statement (Assignment)►       ◄Keyboard Scan Codes►
    ◄KeyDown Event►                    ◄KeyPress Event►
    ◄KeyUp Event►                      ◄ON KEY Statement►