在窗口中挖一个洞，透过这个洞可看到背后的其他东西,可用鼠标操作背后的文件等，精选VC++学习源码，很好的参考资料。-Dig a hole in the window, you can see through the hole behind the other stuff available documents, such as behind the mouse, the selection of learning VC++ source code, a good reference.