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

       /ALL (default)

    Indicates that all logical names in the specified logical name
    tables are to be displayed. If you do not enter the /PROCESS,
    /JOB, /GROUP, /SYSTEM, or /TABLE qualifier, all logical names
    in the tables specified by the logical name LNM$DCL_LOGICAL are
    displayed.