The DEFINE KEY command assigns definitions to the peripheral keys
    on certain terminals. These definitions can direct CDO to perform
    one of the following actions:

    o  Execute a CDO command

    o  Append a qualifier to a CDO command

    o  Append a text string to a CDO or system-level command

    When you define a key to insert a text string, use the
    /NOTERMINATE qualifier so that you can continue typing more data
    after CDO inserts the string.

    You should take advantage of the echo feature in most instances.
    With /ECHO set, CDO displays the key definition on the screen
    each time you press the key.

    You can use the /SET_STATE qualifier to increase the number of
    key definitions available on your terminal keyboard. You can
    assign the same key any number of definitions, as long as you
    associate each definition with a different state. State names can
    contain alphanumeric characters, dollar signs, and underscores.

    See the SET KEY command for information on changing keypad
    states.

    Redefineable Key Names and Terminal Designations lists the keys
    you can define on the keyboards of different terminals.

    Table 1-3 Redefineable Key Names and Terminal Designations

    Key Name         VT100-series    VT200- and VT300-series

    PF1              PF1             PF1
    PF2              PF2             PF2
    PF3              PF3             PF3
    PF4              PF4             PF4
    KP0, KP1, ...,   0, 1, ..., 9    0, 1, ..., 9
    KP9
    PERIOD           .               .
    COMMA            ,               ,
    MINUS            -               -
    ENTER            ENTER           ENTER
    LEFT             < -             < -
    RIGHT            - >             - >
    E1               -               FIND
    E2               -               INSERT HERE
    E3               -               REMOVE
    E4               -               SELECT
    E5               -               PREV SCREEN
    E6               -               NEXT SCREEN
    HELP             -               HELP
    DO               -               DO
    F6, F7, ...,     -               F6, F7, ..., F20
    F20