OK, so is there a way to accomplish the following:
www.domain1.com/forum1
www.domain2.com/forum2
User logs into forum1 and does not need to have a separate user account to log in to forum2.
Ideally, this would be seamless in the sense that a user logged in to one set of forums would not need to "re-log-in" to the other set of forums. However, I'm cool with it being a bit of a hassle as long as they don't actually have to have separate user accounts.
Any ideas?