I setup PunBB for a client of mine, and they're lovin' every minute of it so far. Unfortunately, their latest request has me stumped... They're using the forum to discuss sensitive information, and it irks them that their web browsers remember to keep them logged in, even after they close and open their browser again. Is there a quick fix to make PunBB request that users login on every session? I've tried removing and modifying different bits of cookie code, but it either just breaks the login completely, or throws out other unexpected errors.