This lecture covers the Common Gateway Interface protocol. This includes the protocol itself, how to build CGI handlers in a variety of languages, and issues relating to reliability, efficiency, and session management.

• The web server and the CGI handler in four steps: detection/launch, impersonation, environment vars, and I/O.
• CGI handlers in shell script, C, and Java
• Processes and threads, reliability, and efficiency
• CGI handlers in Perl
• Session management and tracking

• Do Lab-2. Use the Discussion Group if you encounter problems.
• As you learn Perl or PHP from a book or from one of the resources in the Resources pages, add a contribution to the corresponding Our Own Wiki page (under Resources). You are asked to add one, and only one, section that captures one idea. Start it with a header title.

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