auth_systems is a configuration setting that controls which challengers are available to this TiddlyWeb instance. It is a list of strings with each string representing the name of a module that implements the ChallengerInterface. The name is first looked up in the tiddlyweb.web.challengers package space. If not found there, sys.path is searched.

If there is only one challenger configured a request that redirects to the challenger system will go directly to that challenger. If there are multiple challengers configured the user will be presented with a list of choices.