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How CGI Works

To really understand the power of CGI and how you can use it, we will look at the nitty-gritty of how CGI works when it is used on a Web server. Nothing is overly complicated about CGI; it simply extends the process that occurs when an ordinary Web page is requested by a user.

HTML Documents

As explained previously, the Web is a conversation between two computers. The computer trying to fetch a Web page is called the client. The client machine is running a Web browser—the software that requests and displays pages of HTML. When the client wants a Web page, it sends a URL to a server.


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