VMS Help LIBRARY, /EXTRACT, Example  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  $ LIBRARY/EXTRACT=(ALLOCATE,APPEND)/OUTPUT=MYHELP SYS$HELP:HELPLIB.HLB

      This LIBRARY command specifies that the modules ALLOCATE and
      APPEND are to be extracted from the help library HELPLIB.HLB
      and output to the file MYHELP.HLP in your current default
      directory.