Past few days I have been looking for a way to have a real single sign on between mediawiki and phpbb. I wanted the login state in phpbb to dictate that in mediawiki. I got it working. If you logout of phpbb, you logout of mediawiki, if you login to phpbb you are then logged into mediawiki. In mediawiki I have it checking the session of phpbb and doing an auto log. BUT THERE IS A HUGE ISSUE: I had to replace every instance of User (Class) in every mediawiki file with mw_User because phpbb also has a user class. I know a lot of people have asked about this. It is possible, but it is a ton of work. This is nothing short of a hack, but for anyone interested, I though I would share. -Adam