TECO's HELP command can be used to get information about TECO or to
  access any standard OpenVMS HELP library.

  Format:

   HELP [[/LIBRARY]=[=]name] [key-1 [key-2 [...]]]

  Using the =name qualifier selects a HELP library other than the TECO
  library.  The ==name format both selects the library for this HELP
  command and makes it the default library for subsequent HELP commands.
  For example

   HELP ==HELP SYSTEM $ASSIGN

  would select the system HELP library, establish it as the default, and
  tell you about the Assign I/O Channel system service.

  The Key-n parameters obey the standard OpenVMS HELP syntax rules.