I need a small add-on that would show on each thread which members have viewed and not viewed that thread, somewhere near the top of the page. It would be nice to have this list collapse-able. I would like the ability to see this list of members to be permission based. I realize this is probably a bad idea for any open membership or large forum.In my case the lists would be small, as membership would be very limited and local (i.e. business intranet).