If you are connected onto a network, like the University’s, you could chat with your friends from the command line, or check if they are online. If you have no access to the command prompt this ‘proof of concept’ application will provide a command prompt.
Of course, in order for this application to work your network administrator should have enabled the ‘net send’ otherwise it wont work. This ‘proof of consept’ application was developed back in 2002. It wont work in the University’s network anymore, but it can work at your private LAN.