[Lynne]

Basically what you want to do is when a user logs in at your shop, you need to add the code to log them into the forums also (and vice-versa - when a user logs in on the forums, they get logged in at the shop). You'd have to do something to 'pre-populate' the vbulletin user tables (there are a few) for the forums though. It can be done, but it's a matter of how good a coder you are. You can also make a post in the Request for Paid Services if you want to pay someone to write the code for you.