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

    Indicates that only the group logical name table is to
    be searched. The /GROUP qualifier is synonymous with the
    /TABLE=LNM$GROUP qualifier. If you specify the /GROUP qualifier
    and you do not also specify a logical name, all names in the
    group table are displayed.