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

       /HOST=host

    Required when first setting the interface; optional if the
    interface is already defined. Always required for a SLIP
    interface. Optional for a PPP interface unless you are setting
    up the local host as a dialup provider by using the /DESTINATION
    qualifier.

    Local host name or IP address using the interface. If not
    specified for a PPP interface, PPP obtains the correct address
    from the remote host.

    If your host is multihomed, specify an address.