[Lynne]

If you are a proficient coder, then it isn't hard at all to do what you want. You basically want to copy the vbulletin registration code and add it to your site registration so they get registered at both sites and then you want to copy the vbulletin login code and add it to the site login code to log the user in to both sites at the same time (and vice versa - copy the site login code into the vbulletin login page so when they login to vbulletin, they are also logged into the site).