The Authorizer does user authorization checking. Each instance of authorizer keeps track of the realm that it is authorizing for, and the table of authorized users. An authorizer can be asked to return the user name/symbol associated with a userID (which concatenates the username and password from the HTTP request) with the user: method.

	realms
	realm realm:

	authentication	top
	encode:password: Encode per RFC1421 of the username:password combination.
	mapFrom:to: Establish a mapping from a RFC 1421 key to a user.
	mapName:password:to: Insert/remove the encoding per RFC1421 of the username:password combination into/from the UserMap. DO NOT call this directly, use mapName:password:to: in your ServerAction class. Only it knows how to record the change on the disk!
	user: Return the requesting user.

	realms	top
	realm
	realm:

	as yet unclassified	top
	unauthorizedFor: