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Chapter 35. CGI and Pre-Processing Funda... > Using Popular Scripts and Applicatio...

Using Popular Scripts and Applications

After reading through the preceding sections, you should have a basic idea of how CGI works. When a CGI application is requested, the Web server passes information to the CGI application through environment variables and sometimes through standard input as well. After the CGI application has completed its processing, the results can be sent back to the Web browser through the Web server.

To better illustrate how this communication interface works, this section will walk you through two examples of commonly used CGI applications. The first example covers the use of a feedback form on your Web site. The second demonstrates how to use a CGI script to maintain a guestbook on your Web site.


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