[Zope] Logon process

Hi all! I've developed a site that if you are not logged in renders in a way but if you are logged in renders in another way (with more functionality) I would like to create a logon form and the validate the user in an AJAX way Where can I read about it? Or where the acl_users code is located? I would like to avoid the use of alternatives acl_users products if possible because I would like to store users on the ZODB normaly as original acl_users object do (I don't need ExUserFolder or similar if possible) Thanks! -- Mis Cosas http://blogs.sistes.net/Garito