说明：  本实例将介绍在安装应用程序中需要实现关闭或重启计算机的功能。程序运行之后，通过单击窗体中的控制按钮就可以重新启动、关闭或者注销计算机。
(The examples will describe the installation of the application needs to implement the functions shut down or restart the computer. After the program runs, the form by clicking the control button to restart, shut down or log off the computer.)