实现一个简单远程监控软件，采用Windows Socket（或Java Socket）编程。采用C/S架构。（1）能够远程监控一台主机，显示主机屏幕内容，能远程关机（2）能远程下载或上传文件（3）能远程执行一些DOS命令（4）能远程运行一些可执行命令。

-Implement a simple remote control software, using Windows Socket (or Java Socket) programming. By C/S architecture. (1) to remotely monitor a host, the screen displays the contents of the host, can remotely shut down (2) can remotely download or upload files (3) can remotely perform some DOS commands (4) can remotely run some executable command.