In-Out Board is a staff in/out tracking tool that works across different platforms. With peer-to-peer technology, users can easily see who is available or not. It also allows leaving notes on how co-workers can be reached.

One of the best things about In-Out Board is its customizable status categories. You can tailor these to suit your office's needs, which makes it easy for everyone to communicate their whereabouts. Additionally, you can customize the software to notify users of status changes with different sounds, which can help keep everyone informed.
In-Out Board uses a tried and tested peer-to-peer networking engine, which means it requires no server. This makes it easy to set up and use, and it can even connect remote offices over the internet. If you're looking for a reliable and straightforward way to track your staff's comings and goings, you can't go wrong with In-Out Board.
Version 2.1: http://www.glassbead.com/inoutboard/relnotes_iob.shtml