How does vBulletin detect when someone enters the forum?

[Wongod]

When someone enters the forum, the guest count is increased. How is this done? Is it done through the session code? And if so, where is the session code located?

[amykhar]

Yes, it's the session code. And, code concerning sessions can ultimately be traced to class_core.php I believe. (I may be wrong on that one - relying on memory)

[Wongod]

Thanks amy! I'm trying to create a session on a page outside of the vbulletin directory. How would I do this? I assume the current session code is accessed in the common vBulletin header but I haven't been able to find it.