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. When
    you define function keys, you can use the DEFINE/KEY /IF_STATE
    command to assign a specific state name to the key definition.
    If that state is not set when you press the key, the definition
    is not processed. The SET KEY/STATE command enables you to change
    the current state to the appropriate state.

    You can also change the current state by pressing a key
    that causes a state change (a key that was defined with
    DEFINE/KEY/LOCK_STATE/SET_STATE).

    Related commands:

       DELETE/KEY
       DEFINE/KEY
       SHOW KEY