[Zope] what product for authentication from db?

Zope newbie here... I have a group of users on an existing system that holds user/password info in a postgres database. I now am building a Zope application that these same users will log into. I want to authenticate from my database. I can't make out which product is best and most up-to-date for this -- the New Riders Zope Book talks about LoginManager, but it apparently won't work with the most recent Zope. So, Extensible User Folder, Generic User Folder, Simple User Folder, or something else? Thanks for any recommendations. rob __________________________________________________ Do You Yahoo!? Yahoo! Health - Feel better, live better http://health.yahoo.com