Library /sys$common/syshlp/uafhelp.hlb SHOW, /IDENTIFIER, Qualifiers, /USER  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /USER=user-spec

    Specifies one or more users whose identifiers are to be
    displayed. The user-spec can be a user name or a UIC. You can
    use the asterisk wildcard character (*) to specify multiple
    UICs or all user names. UICs must be in the form [*,*], [n,*],
    [*,n], or [n,n]. A wildcard user name specification (*)
    displays identifiers alphabetically by user name; a wildcard
    UIC specification ([*,*]) displays them numerically by UIC.