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

       /USER_NAME=vms_user_name

    Optional. Default: All users, all hosts.

    With /HOST, clears the counters relating to the specified users
    sharing the specified OpenVMS account.

    Do not specify a list of names; specify only a single name.