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

 id-name

    Specifies the identifier name. The identifier name is a string of
    1 to 31 alphanumeric characters. The name can contain underscores
    and dollar signs. It must contain at least one nonnumeric
    character.

 user-spec

    Specifies the UIC identifier that uniquely identifies the user
    on the system. This type of identifier appears in alphanumeric
    format, not numeric format; for example, [GROUP1,JONES].