计算crc校验码的程序，便于理解基本算法

dns 解析源代码-dns source code analysis

以太网端口保护协议，华为的技术白皮书，做电信级产品需要知道。

there are two parts in this zip file one is the android client to run on a android device another is the java server to run on a compute which already install the office and open the powerpoint so,the first thing is run the java server on the target compute and before this you have already opened a ppt then, modify the socket ip to your compute ip and run the client on the android device finally you can use the android client to control ppt on the compute

使用VOIP进行网络传输声音的类库，内包含一个详细的例子-a library for voip,an detailed demo is provided

http代理程序-http agent

this is sample about DHCP-agent

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从internet上下载文件(http协议)的程序- Downloads the document from internet (the http agreement) the procedure

WinSocket网络编程-Winsocket Network Programming

用Winsock实现文件的下载-download files using winsock.