/HELP [command|+topic]

Display some help about a command or a topic.
If no argument provided a usage of this command is printed.
Available commands: add, alias, authorization, bind, buffer, clear, connect, del, disconnect, event, group, help, info, move, msay, pgp, quit, rawxml, rename, request, room, roster, say_to, say, set, status_to, status, version.