Interesting: Web Based Web Crawler

Interesting bit of code, I would like to "play" with and see how it works.

http://snippets.dzone.com/posts/show/3853

"This is based on Web crawler code I found on this site. This version allows your to run the crawler from a Web page, instead of from a command line, and output the results to the Web page. This would be useful for someone who wants to harvest links for a search engine or for someone who works for a Web security company and wants to harvest suspicious URLs for inclusion in a database."