Keypad mode must be enabled (SET MODE KEYPAD) before you can use
    this command. Keypad mode is enabled by default.

    By default, the current key state is the DEFAULT state. You can
    change the current state by using the SET KEY/STATE command or
    by pressing a key that causes a state change (that is, a key that
    was defined with DEFINE/KEY/LOCK_STATE or /SET_STATE).

    Related commands:

       DEFINE/KEY
       DELETE/KEY
       SET KEY