Twisted Python and Bonjour

Bonjour (formerly Rendezvous) is Apple's service discovery protocol. It
operates over local networks via multicast DNS. Server processes announce
their availability by broadcasting service records and their associated ports.
Clients browse the network in search of specific service types, potentially
connecting to the service on the advertised port using the appropriate network
protocol for that service.

A common example of Bonjour in action is iTunes' music library sharingfeature. iTunes...