the4th

基于udp实现可靠传输的原理实现了一个简易的邮件系统。存储利用文件来实现，不涉及数据库。(Udp achieve reliable transmission based on the principle of achieving a simple mail system. Storage of papers to achieve, does not involve a database.)

允许用户网络chat交流并且更新，共享文件 (Internet chat allows users to exchange and update, share files)

精通黑客编程光盘代码,适用于新手学习，不要用于非法用途，谢谢合作(CD proficient hackers programming code for beginners to learn, not for illegal purposes, thank you)

说明：  Socket是建立网络连接时使用的。在连接成功时，应用程序两端都会产生一个Socket实例，操作这个实例，完成所需的会话。(Socket is used when a network connection. The connection is successful, the application will have a Socket instance ends, the operation of this example, the completion of the required sessions.)

用BitBlt()函数实现界面切换的程序设计方法,其中包括：新建项目,用函数实现文件的打开操作以及相关的程序设计,(The program design method of interface switching is realized by BitBlt () function, which includes: new project, file opening operation with function, and related program design.)

搭建一个有4个部门的公司网络，包含研发部门、测试部门、管理部门和销售部门，利用局域网模型在一个对象中模拟一个服务器和多个客户端的行为(Set up a department of four corporate network, including R & D department, testing department, management department and sales department, the use of local area network model of an object in the simulation at a server and multiple clients of conduct)

说明：  在Internet上的聊天室程序一般都是以服务器提供服务端连接响应，使用者通过客户端程序登录到服务器，就可以与登录在同一服务器上的用户交谈，这是一个面向连接的通信过程。因此，程序要在TCP/IP环境下，实现服务器端和客户端两部分程序。(In Internet chat rooms on the procedure is generally based on the server side connection in response to the provision of services, the user through the client program to log on to the server, you can log in the same server with the user to chat, this is a connection-oriented communication process. Therefore, procedures to TCP/IP environment, the realization of server-side and client procedures in two parts.)

VB纯代码，内嵌汇编，对指定进程发送网络数据包。(VB pure code inline assembler, network packet sent to the specified process.)

chat room using winsock in visual basic

本源碼是一個用從Internet的Web頁面上得到Email地址,采用多線程遞歸算法(This source code is a Web page is available from the Internet, get Email address, using a recursive algorithm for multi-threaded)