How do I access the Yahoo Stock Screener from an outside application?

I have seen lots of stock screener applications on the web made with Yahoo. I guess this means that there is a way to access individual stock quotes. I just don’t know how to do it. Can you help?

Sure. You need to learn the Yahoo API. Yahoo basically opens up its service via an API that you can call on your website using HTML and javascript. All the information you’ll ever need to know on Yahoo APIs is here:

http://developer.yahoo.com/