As the name implies, it is built on top of IP multicast, in which one transmitter can send one message and have it be received by more than one receiver.
顾名思义，这个协议是在ip多播之上构建的；在ip多播中，一个发送器可以发送一条消息并使多个接收器接收到该消息。
However, if any host in the network wishes to send a message to this multicast group and is not interested in receiving a response, then using ACE_SOCK_Dgram for sending purposes is also sufficient.
如果网络中的任何主机希望向这个多播组发送消息，但是对接收响应不感兴趣，那么使用ACE_SOCK_Dgram发送消息也可以。
We propose a model of multicast real-time in DQDB network, examine the desired properties and the difficulties in achieving these properties, and introduce its main message process.
我们提出一种在DQDB网络中实现多点实时通信的模型，分析了期望的性质和实现的主要问题，并介绍了在该模型下消息处理过程。
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