[Zope] creating users

Hello List, I'm new to Zope and am investigating how to create a system where users (visiting users, not in-house users) could create an account and manage their preferences? I've looked through the Guides and HowTos but saw nothing to that effect. The closest thing i found was the chameleon folder, but this is just a single preference stored in a cookie. I really need the users to "create" a profile and "log in" through a web interface (a la excite, for instance), not the browser/server security login. There must be a Product out there that does that? Alex.