Broadcast Multicast - Delivery of a stream to many clients by a Windows Media Server. The server keeps track of the stream by monitoring the IP address over which the stream is multicast.

Multimedia Broadcast Multicast Service (MBMS) - MBMS is a broadcasting service that can be offered via existing GSM and UMTS cellular networks. The infrastructure offers an option to use an uplink channel for interaction between the service and the user. See Wikipedia for a continuation of this definition. Also see Mobile TV.

Broadcast Unicast - A point-to-point connection that a client initiates on a Windows Media server.