XWiki Athentication Integration

Hello, We're currently working on integrating xwiki in an educational plattform. That means, we need to provide an xwiki-page for each course. We have retty much all methods laid out and most of it working, the only thing we are still not sure about handling is the automatic login, before a user gets to see a specific xwiki-page. Adding users, groups and setting the permissions (in the xwiki) is all dealt with already - the only thing that is missing is the automatic login. Is this possible with the existing methods or do we have to write our own authentication-service? If so, is there sample code or anything you could point us to how to proceed? An option we were contemplating was, posting the login data to the actual xwiki login form in the background (similar to what the curl-library provides in php), but this might just be unnecessary, if there is a certain existing method we can utilize for that. Thanks a lot for your help in advance! Florian -- Der GMX SmartSurfer hilft bis zu 70% Ihrer Onlinekosten zu sparen! Ideal für Modem und ISDN: http://www.gmx.net/de/go/smartsurfer