I set up an Ubuntu 9.04 Server fordevelopment purpose and made it online through dyndns [more info], It can access by anyone of our team. We got some accessing problem because all our developers logged in through ssh without any need. So there are many users logged in and stay idle.
What we need to increase the efficiency is to force all idle users out. Here how I do this:
THIS IS BASED ON UBUNTU SERVER EDITION 9.04