Network Radio Program

Hello.

A few months ago I was watching The ScreenSavers, on TechTV, and on the show they featured a program that would enable a person to broadcast their music collection, like internet radio, after a small network (i.e. home network). Is anyone familiar with such a program and where I could download it? I would like to give it a try but cannot remember the name of it. I have searched the show's website, but cannot find it anywhere.

Thanks for any help.
Robert