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

       /USER_NAME=vms_user_name

    Required.

    Specifies the user name of the owner of the container file
    system. The user name must be in the proxy database. The
    specified user becomes the owner of the internal root directory
    of the container.