Use the DEFINE/KEY and DELETE/KEY statements to create your own
    key definition file, as described in the following sections.

    The DEFINE/KEY statement assigns a new function to a particular
    key:

    DEFINE/KEY [/STATE=EXTEND] key_name function

    /STATE         Optional. Default: nonextend mode.
                   Redefines the key in extend mode.
    key_name       Standard key name.
    function       TN3270 function you want mapped to this key.

    You can define most of the named keys both in normal (nonextend)
    mode and in extend mode.

    You can define the control keys (and the synonyms for them) in
    normal mode only. Do not specify the qualifier /STATE=EXTEND.

    The following example assigns the EXIT function to the key
    sequence EXT + Z :

    $ DEFINE/KEY/STATE=EXTEND "Z" EXIT

    The DELETE/KEY statement removes the function assigned to a
    particular key. Use the following format:

    DELETE/KEY [/STATE=EXTEND] key_name

    /STATE         Optional. Default: nonextend mode. Deletes the key
                   in extend mode.
    key_name       Standard key name.