HELP_TEXT

  Invokes the VMS HELP utility.  You specify the help library that will be
  used for help information, the initial library topic, the prompting mode
  for the HELP utility, and the buffer for writing the help information.

  Syntax

     HELP_TEXT (string1, string2, keyword, buffer)

  Parameters

     string1    The name of the help library to use.  Put the string in
                quotes.  If you specify only a filename, the HELP utility
                looks for a file in SYS$HELP with the file type .HLB.

     string2    The initial library topic.

     keyword    Specifies whether the prompting mode for the library is ON
                or OFF.

     buffer     The buffer for writing the information.

  Example

     HELP_TEXT ("tpuhelp", (READ_LINE("Topic:  ")), OFF, help_buffer)

  Prompts the user to type a help topic.  The HELP utility uses the library
  called SYS$HELP:TPUHELP.HLB.  The information is written to the help
  buffer.