VMS Help DEASSIGN, Qualifiers, /SUPERVISOR_MODE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /SUPERVISOR_MODE (default)

    Deletes entries in the specified logical name table that were
    created in supervisor mode. If you specify the /SUPERVISOR_MODE
    qualifier, the DEASSIGN command also deassigns user-mode entries
    with the same name.