Login: Vanilla Integration to My Site

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My site has a login form. How can I setup for automatically login to vanilla forum when a user is login using my login form.

For example, my site is at www.example.com and vanilla forum is at forum.example.com.

Thanks

Mark

Here's a comment about what we're currently working on in this regard:

http://vanillaforums.org/discussion/comment/96054/#Comment_96054