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(Common Gateway Interface), is generally the most way for web servers to interact dynamically with users. Common uses include online feedback and online forms.
This takes the form of a computer program that allows web servers to forward requests for processing to other programs, which then return their results to the web server.
Depending on the context in which the acronym is used, CGI can also stand for Computer Generated Graphics.
Screen Scraping with PHP
The Dark Art of screen scraping... it is sometimes frowned upon, and often shunned when it is used for the wrong purposes. I see it as a scripting challenge! Whatever your views on the practice of Screen scraping- you might find this as a good start for PHP.
Dealing with Tomcat's cache on Debian
This can be really annoying. You want to develop 'rapidly': so you use 'apt-get install tomcat'. You can begin working on your applications right away and then... why isn't this changing? Am I in the right directory?? Maybe... I could just be that the Debian configuration of Tomcat is set up for production (not development)!