[Zope] User Database

Hi...got another question. :) I see that Zope can create users very easily, but... Let's say I want to create a user database where people can sign up and get an account with free web space, email, etc..... How would I do that? Is it the same function as the acl_users object or is it something that has to be downloaded and scripted, etc? Thanks, Newbie Nat. :)