With the rapid development of Internet and the coming of information age,Internet has a huge impact on people's lives.Network instant messaging system has become a very important communication tool,which has been accepted by more and more Internet users.Now,There are many excellent instant messaging software emerged ,in which some are used broadly such as Tencent QQ,Microsoft MSN ,Sina UC, Baidu HI, etc.in the aspect of the local area LAN, there are enterprise-class GoCom, RTX, a free IP Messenger, FeiQ and so on.
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