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<p>Researchers have produced the Multicast Backbone (MBone), which provides audio and video connectivity from outer space to under water/spl minus/and virtually everyplace in between. MBone is a virtual network that has been in existence since early 1992. It originated from an effort to multicast audio and video from meetings of the Internet Engineering Task Force. Today. hundreds of researchers use MBone to develop protocols and applications for group communication. Multicast provides one-to-many and many-to-many network delivery services for applications such as videoconferencing and audio where several hosts need to communicate simultaneously. This article describes the network concepts underlying MBone, the importance of bandwidth considerations, various application tools, MBone events, interesting MBone uses, and provides guidance on how to connect your Internet site to the MBone.</p>

D. P. Brutzman and M. R. Macedonia, "MBone Provides Audio and Video Across the Internet," in Computer, vol. 27, no. , pp. 30-36, 1994.
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