习作大家看看.以上为病毒入口，并加上I am sorry! happy time的注释，以表明此文件已被感染过。-exercises see. Above the entrance of the virus, plus I am sorry! Happy time of the Notes to make this document has been infected with.

opnet培训练习使用的源代码anim，主要用于熟练OPNET的相关操作。-opnet training exercises to use the source code anim, mainly for skilled OPNET related operations.

利用Tcp/IP协议，实现了局域网的视频通话，适合初学者，做课程练习用-Tcp/IP protocol, LAN video calls, suitable for beginners, do lab exercises