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Writing Basic CGI-bin Applications

1. The address of the CGI application is selected in a browser. This address is a standard URL, e.g. http://www.xxx.yyy/cgi_bin/hello_world.
   The browser sends it to the corresponding HTTP server.
2. The executable ``hello_world'' (in directory cgi_bin) is started by the HTTP server.
3. The output (stdout) of the executable (which has to be in HTML -or MIME- format) is taken by the HTTP server,
4. and passed on to the Browser, which displays it.