The options listed below under "Additional Information Available"
    describe the keyboard functions. Preceding each function
    description are the key sequences for VT100 and VT200 terminals
    and the function name to use in a DEFINE/KEY command. In many
    of the key sequences, TN3270 allows use of the extended function
    (EXT) feature. Used in conjunction with another key, EXT allows
    access to an extended function for that key. The following
    illustrates the extended function feature in more detail.