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组播（Ｍｕｌｔｉｃａｓｔ）是计算机网络中的一种特殊的、高效的通信方式，在这种方式中，发送者有选择地向一组接收者发送信息，在多点通信中具有不可替代的作用．本文描述了组播的机制和特点，具体说明了组播在Ｗｉｎｄｏｗｓ下的应用方法和实现过程．
Multicast is a special and efficient communication method in computer networks. In this way, the sender selectively sends messages to a group of receivers and plays an irreplaceable role in multipoint communication. This article describes the multicast mechanism and features, specifically describes the multicast in the Windows application method and implementation process.