It is a streaming application to be used over 24+ kbit/s networks, like LAN's and ISDN.

NetStreamer consists of a program to "receive" audio, and a program to "transmit" audio. Both programs connect to a NetStreamer Server, a kind of reflector that takes care of the distribution of audio. Every transmitter contacts a Server at startup and claims a certain frequency somewhere between 88.0 and 108.0 MHz, and receivers can tune in on one of these transmitter frequencies.