The web server has a configuration file which tells it if a certain program is to be run as a CGI script or not. If the answer is "yes", the web server sets up all these variables before calling the script.
For example, will QUERY_STRING have different name before its named by web server ?

The web server likely has an internal data structure that holds that information - it doesn't matter how that thing is called.

Perl 6 - links to (nearly) everything that is Perl 6.

In reply to Re^5: CGI program by moritz
in thread CGI program by manishrathi

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