Integrating Vanilla into my current User system?

Atul

I already have a user login and registration system in place. I am thinking of adding forums to my website, and I have 2 options at the moment
1. Is to create my own forums from scratch which will take up a lot of time
2. Is to integrate Vanilla forums to my website with my current login system since I don't want my users to sign up separately for the forums.
So I just wanted to ask if it's possible to integrate Vanilla forums into my current user setup? If so could point you me to the documentation or someplace where I can understand how vanilla manages it's users login, sign up and session/cookies so that I can change it according to my needs.
Thanks

Mark

Vanilla 1 was difficult to integrate.

There is a single sign-on plugin for Vanilla 2.

Plugin here: http://vanillaforums.org/addon/472/single-signon
Documentation here: http://vanillaforums.org/page/SingleSignOn