vpn虚拟专用网络的一个开源搭建工具，可以按你的要求自己搭建一个虚拟专用网-vpn virtual private network to build an open source tool, you can request your own by creating a Virtual Private Network

一个可以在运行期调整界面控件位置和大小的组件-An interface controls the operation of adjusting the location and size of components