说明：  TCP/IP Winsock编程实例，利用Winsock编程由同步和异步方式，同步方式逻辑清晰，编程专注于应用，在抢先式的多任务操作系统中(WinNt、Win2K)采用多线程方式效率基本达到异步方式的水平，应此以下为同步方式编程要点进行快速通信
(TCP/IP Winsock programming examples, the use of Winsock programming from synchronous and asynchronous, synchronous mode logic clear and programming focus on the application, preemptive multitasking operating system (WinNt, Win2K) using multithreading efficient way to achieve the basic level asynchronous mode, the following should be here for synchronous mode programming essentials for quick communication)