ZeroConf Support with Avahi and friends

ZeroConf allows computers to communicate on a network without any kind of configuration, additionally it provides for discovery of services, so instead of specifying an IP you can select from a list of advertised servers on the network. This is usefull so that you can simply plug two laptops together an transfer a file or play a network game. It is also usefull in situations where you don't know about the other services, such as people to chat to or files to share.