/sys$common/syshlp/helplib.hlb CREATE, /NAME_TABLE, Parameter  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 table-name

    Specifies a string of 1 to 31 characters that identifies the
    logical name table you are creating. The string can include
    alphanumeric characters, the dollar sign ($),  and the underscore
    (_).  This name is entered as a logical name in either the
    process directory logical name table (LNM$PROCESS_DIRECTORY) or
    the system directory logical name table (LNM$SYSTEM_DIRECTORY).