The way it works now vBulletin is this:
Every time an user (guest or member) enters the site, a unique session is created, that is automatically deleted after 900 seconds, if not in use anymore.
The highlighted part, userid=0, reflects only the guests, since they have no userid's. So the query counts the the sessions opened by those users, not their user agent or any other ident method.
Unfortunately, there is no way around this... is not as simple as it is with members.
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