This is the correct place. You may want to do a search on this and even look in the articles forums because I think this has been covered before.
I actually have two user tables on my site. One for vbulletin, the other for my tracker. What I do is when someone registers on my vbulletin site, I added code to also register them on my tracker. They can't ever 'see' the tracker, so I don't need to do the same thing from that end, but I think what you want it to do it both ways.... if they register on your site, you register them on vbulletin also. And, if they register on vbulletin, you register them on your main site also. You'll also need to have login log them into both sites too.
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