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Chapter 12. Forms > Introduction to Forms

12.2. Introduction to Forms

HTML form tags merely provide an interface and controls for gathering information. The real work is done by forms-processing applications, usually CGI scripts, behind the scenes. CGI (Common Gateway Interface) is the interface between HTTP (the program responsible for web transactions) and other programs on the server.

A CGI program (or script) can be written in a number of programming languages. It doesn't matter to the server which one, as long as it can retrieve data and send data back. On Unix, the most popular language is Perl, but C, C++, Tcl, and Python are also used. On Windows, programmers write scripts in Visual Basic, Perl, and C/C++. On the Mac, AppleScript and C/C++ are common.


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