/LIBRARY=file-spec
    /NOLIBRARY

   Controls whether an alternate HELP library is used in place  of  the
   default system library, SYS$HELP:HELPLIB.HLB.  The specified library
   is used  as  the  main  HELP  library,  and  is  searched  for  HELP
   information  before  any  user-defined  default  HELP  libraries are
   checked.

   If you omit the device and directory specification, the  default  is
   SYS$HELP,  the  logical  name  of  the  location  of the system HELP
   libraries.  The default file type is HLB.

   The /NOLIBRARY qualifier is used to exclude the default HELP library
   from the library search order.