/sys$common/syshlp/helplib.hlb REPLY, Qualifiers, /ENABLE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /ENABLE[=(keyword[,...])]

    Requires OPER (operator) privilege. Requires OPER and SECURITY
    privileges for security messages.

    Designates as an operator's terminal the terminal at which the
    REPLY command is entered, if OPCOM is running. The /ENABLE
    qualifier cannot be entered from a batch job. To enable the
    following types of messages displayed on an operator's terminal,
    specify one of the following keywords:

    CARDS              Displays messages sent to the card readers.

    CENTRAL            Displays messages sent to the central system
                       operator.

    CLUSTER            Displays messages from the connection manager
                       pertaining to cluster state changes.

    DEVICES            Displays messages pertaining to mounting
                       disks.

    DISKS              Displays messages pertaining to mounting and
                       dismounting disk volumes.

    LICENSE            Diplays messages pertaining to software
                       licenses.

    NETWORK            Displays messages pertaining to networks;
                       the keyword CENTRAL must also be specified to
                       inhibit network messages.

    OPER1 to OPER12    Displays messages sent to operators identified
                       as OPER1 to OPER12.

    PRINTER            Displays messages pertaining to print
                       requests.

    SECURITY           Allows messages pertaining to security events;
                       requires SECURITY privilege.

    TAPES              Allows messages pertaining to mounting and
                       dismounting tape volumes.