2 forums, 1 user db (or 3 forums 1 user database)

[neoweb]

Hello I have multiple SMF's
I want a user to be able to login at all forums with just one loggin
My forums are in 3 different databases.

Can I do a find-and-replace. or something?

[Jerry]

http://www.simplemachines.org/community/index.php?topic=16190.0
I think that will help , not sure if it would work if all the forums had many posts and different users.