The counts are kept in the forum table, and calculated for each forum in function build_forum_counters() (in includes/functions_databuild.php). (I'm not sure if that's called whenever a thread or post is added/deleted or a cron job like mentioned above). In forum.php it adds up the totals for all forums. It definitely takes in to account deleted posts and threads, but I don't know about private forums. You should be able to figure that out pretty easily (assuming you have private forums) by comparing what you see when you're logged in vs. logged out.
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03-14-2012, 02:34 PM
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