group communication
5.On the communication models, CNN is the first to turn Today News Today into Now News Now, which has achieved true classified communication and group communication.
7.SHM Protocol in this paper now only based on certain backbone topology, but it gives a new resolution for realizing the large and real-time group communication service, improves the development of group communication mechanism research.
8.Computer Supported Cooperative Work (CSCW, Computer Supported Cooperative Work) is now an important direction of the computer network technology. Group Communication (GC, Group Communication) technology is the base element of the CSCW, it plays a important role in the CSCW architecture. To implement GC, we usually use the Network Layer Model or the Application Layer Model.

