Can someone tell me how to set up vBulletin (like this forum) with single-signon to NetSuite? I have two clients who wish to accomplish this. Ideally, from the customer center is preferred where we can allow for forum-based peer groups that require login.

Is it simply a url passing thing? Is it cookie related (sign up once and then the cookie stores who you are -- no single sign-on)?

We want to make the forum accessible only through NetSuite (domain filtering), so users need to come via a known link, etc. but want the additional security of logging in as well (to prevent any backdoor approaches).