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

       /LOGICAL_NAMES (default)
       /NOLOGICAL_NAMES

    Copies process logical names and logical name tables to the
    subprocess. By default, all process logical names and logical
    name tables are copied to the subprocess except those explicitly
    marked CONFINE or created in executive or kernel mode.