CERN Server CGI/1.1 Script
http://info.cern.ch/hypertext/WWW/Daemon/User_3.0/CGI/Overview.html
An overview of how to use the common gateway interface with CERN's httpd.
Handling Forms with CERN httpd
http://info.cern.ch/hypertext/WWW/Daemon/User_3.0/CGI/Forms.html
A presentation on how to use HTML forms with CERN's httpd.
The Common Gateway Interface
http://hoohoo.ncsa.uiuc.edu:80/cgi/overview.html
Another overview on CGI programming.
The CGI Specification
http://hoohoo.ncsa.uiuc.edu:80/cgi/interface.html
CGI specifications, including environment variables and a description on how information is passed to CGI program.