Chapter 18. CGI Programming

Unless you've been holed up in a log cabin without electricity for the last few years, you've heard of the World Wide Web. Web addresses (better known as URLs) pop up everywhere from billboards to movie credits, from magazines and newspapers to government reports.

Many of the more interesting web pages include some sort of entry form. You supply input to this form and click on a button or picture. This step fires up a program at the web server that examines your input and generates new output. Sometimes this program (commonly known as a Common Gateway Interface (CGI) program) is just an interface to an existing database, massaging your input into something the database understands and massaging the database's output into something a web browser can understand (usually HTML).