Library /sys$common/syshlp/tcpip$ucp_help.hlb SET, SERVICE, Qualifiers, /ADDRESS  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /ADDRESS=IP_address

    Optional. Default: 0.0.0.0 (all local interfaces receive incoming
    requests for the service).

    If you have multiple Internet interfaces and, therefore, more
    than one IP address, /ADDRESS specifies the particular address on
    which incoming requests are received.

    To define a service name more than once, use /ADDRESS with
    different values for each instance. A reason to duplicate a
    service name, for example, is that your local host has three
    interfaces and you want to make a service available on two of
    them. Each service/interface pair must be unique.