You can get help on a topic by typing:

    HELP topic subtopic subsubtopic...

A topic can have one of the following forms:

    1. An alphanumeric string (e.g. a command name, option, etc.)
    2. The match-all or wildcard symbol (*)

Examples: HELP SUBSTITUTE NEXT
          HELP CHANGE SUBCOMMAND
          HELP CH

If a topic is abbreviated, HELP displays the text for all topics that
match the abbreviation.