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

    /USERLIBRARY=(table[,...])
    /NOUSERLIBRARY

   Controls whether HELP  searches  one  or  more  user-specified  root
   libraries after it has searched the root HELP library.

   When you specify  the  /USERLIBRARY  qualifier,  HELP  searches  the
   process,  group, and system logical name tables for logical names of
   the form:  HLP$LIBRARY, HLP$LIBRARY_1, HLP$LIBRARY_2, and so on,  to
   find  the  file  specifications of any user-defined libraries.  When
   HELP searches for information on a given topic, it proceeds  in  the
   following search order:  root library, main library (if not the same
   as the root library), process  libraries,  group  libraries,  system
   libraries,  and root library.  If the search fails, the root library
   is searched a second time so that the context  is  returned  to  the
   root library from which the search was initiated.

   If you specify only one table for HELP to search, you can  omit  the
   parentheses.   You  can  specify  any  of  the  following  tables or
   keywords:

   ALL      HELP searches the process, group, and system  logical  name
            tables for user-defined library definitions.

   NONE     HELP does not search any of the logical name tables.   This
            specification is the same as /NOUSERLIBRARY.

   PROCESS  HELP  searches  the  process   logical   name   table   for
            user-defined library definitions.

   GROUP    HELP searches the group logical name table for user-defined
            library definitions.

   SYSTEM   HELP  searches  the   system   logical   name   table   for
            user-defined library definitions.

   By default, if you omit the qualifier, /USERLIBRARY=ALL is assumed.