TECO's HELP command can be used to get information about TECO or to
access any standard VAX/VMS 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 VAX/VMS HELP syntax rules.