The Help module is used to get help about the system as a whole and also about each specific module. After the module has been activated, using 0#, send the ID number of the module to get help about. Choosing to get help about the help module itself will give you some help about how to use SvxLink as a whole. As always, end each command with the hash sign.
It is also possible to play a help message without activating the help module first. Just send 0<module id># (e.g. 01#), and the help text corresponding to the given module id will be played back.