Well, AFAIK the last known location (as a path relative to forum root) for every active user session. You could just run a count across that table, filtering by location.
That's pretty rough, of course, but the only possibility I can think of. vB itself AFAIK does nothing else for its own active users in forums functionality.
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Yeah, well, three answers, and I come in last *lol*. I blame my wife asking me questions...
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