这个一个有文件传送功能的程序，会显示文件传送的进度。客户先通过一个登录名进入。客户端和服务端在同一个界面上，也可以发送消息，聊天。-this is a file transfer function of the procedure will show the file transfer progress. First customers through a login access. Client and server with an interface can also send messag