Forum Two Forums, One Shared Database of User Accounts?
 

Hello! I want to know if it is possible to have two sites running two separate licensed copies of vbulletin, yet have them share a single user database? I don't mind if users have to log in twice to access each one, but I would like it so if you register on one it hooks you up to the other. I've got one site I've been building a community on for years, but would like to expand two a new secondary site, but make it easy for my users go between them.