学习多任务环境的编程，理解多任务程序中任务间通信和同步的方法；

掌握Windows环境中多线程程序设计与实现方法。模拟多任务的交互过程，每个任务用线程实现，基本要求如下：

　　任务1：接收从键盘键入的字符，发送给另一任务2；

　　任务2：接收任务1发来的字符，用事件的方式通知任务3接收；

　　任务3：接收任务2发来的字符，并显示；

　　可增加其他功能，如：以秒显示时间等；

　　系统能退出。-Multi-tasking environment to learn programming, to understand multi-tasking process communication and synchronization between the mission of the method　master Windows environment, multi-threaded program design and implementation of methods. Simulation of multi-tasking interactive process, with each mission thread to achieve the basic requirements are as follows: one mission: to receive from the keyboard typed characters, sent to another mission 2　Missions 2: receiving one mission sent by the characters, with events notify the mission to receive 3　mission 3: 2 sent a mission to receive the characters, and displays　increase other functions, such as: display the time in seconds　system can quit.