I had a little question about the database and in particular the part where the user information is stored. What I'm trying to achieve is to have one single database with all the information about the users in it. Users could change this at http://accounts.domain.com, while this information is being used on the forums (http://forums.domain.com) and the main site. To make it a little it easier: all installations are one the same host, so no external databases need to be used.
I hope you can help me with this matter and/or give general advise.