The   HELP   command   invokes   the  HELP  Facility  to  display
  information about a command or topic.  In response to the "Topic?"
  prompt, you can:

     o Type  the  name of the command  or topic for which you need help.

     o Type  INSTRUCTIONS  for more detailed  instructions on how to use
       HELP.

     o Type  HINTS  if you are not  sure of the  name  of the command or
       topic for which you need help.

     o Type HELP/MESSAGE for help with the HELP/MESSAGE command.

     o Type a question mark (?) to redisplay the most recently requested
       text.

     o Press the Return key one or more times to exit from HELP.

  You  can  abbreviate any  topic name, although ambiguous abbreviations
  result in all matches being displayed.