利用Visual c++.net 编写的 系统开关机设置演示 程序。代码都有注释。对初学者很有帮助。能实现：关闭，重启计算机；注销用户名，和关闭计算机并关闭电源等。-Using Visual c . Net system switches prepared demo machine set up. Code have the Notes. Very helpful for beginners. To achieve: shut down, restart your computer ca