说明：  网络编程，当然要用到Windows Socket（套接字）技术。Socket相关的操作由一系列API函数来完成，比如socket、bind、listen、connect、accept、send、sendto、recv、recvfrom等。
(Network programming, of course, uses Windows socket technology. Socket related operations are performed by a series of API functions, such as socket, bind, listen, connect, accept, send, SendTo, recv, recvfrom, etc)