看看， IP地址和计算机名相互转化的多线程处理-look at the IP address and computer name mutual conversion of the multi-threading

telnet的源代码实现,linux学C的可以看看了-telnet achieve the source code, the C linux school can look at the

Dictionary objects take a single key as a look up key. This class simplifies using a Dictionary when you have multiple keys, such as two strings and an int, etc.