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CGI Environmental Variables

One of the methods that the web server uses to pass information to a cgi script is through environmental variables.
http://www.perlfect.com/articles/cgi_env.shtml

Description:

One of the methods that the web server uses to pass information to a cgi script is through environmental variables. These are created and assigned appropriate values within the environment that the server spawns for the cgi script. This page highlights some of the most commonly used ones, along with a brief description and notes on possible uses for them.

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