[Zope] GUF and security

Could someone point me out to some good documentation to explain security in Zope for me? I am trying to set up the GUF through my database, but I find I am having a hard time figuring out proxy logins and the like and would like to read up and have a good understanding of the Zope model before I start outsourcing it to my db. Thanks -- Lucas Vogel lucas7@home.com ICQ: 44697169