VMS Help TCPIP Services, TELNET, TN3270 Keyboard Functions, RECORD  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    VT100: EXT + L              VT200: EXT + Insert Here
    DEFINE_KEY Function: RECORD

    Saves a keystroke sequence on a specific PF key. Invoke the
    RECORD function with the appropriate key sequence (as described
    above), press the PF key as prompted, enter the keystroke
    sequence, and then invoke the RECORD function again. You can
    save a maximum number of 127 keystrokes on each PF key. If the
    status display is enabled when you use the RECORD function, the
    letter R appears on the status line.

    To recall the keystroke sequence, use the PLAY function. Use
    the DV CNCL function to cancel the RECORD function. To erase all
    previously recorded key sequences, use the ER INP function.