利用Windows事件与信号量实现的进程单独运行控制，同一程序每次只允许一个实例存在，新实例会结束旧的，可用于软件更新等功能模块。DEMO给出了简单的列子。-Useing the Windows event and semaphore to control a process, the same procedure allows only one instance exists, the new instance replace the old, can be used for software updates and other functional modules. DEMO shows a simple example.