Each of your computer's components is evaluated to see how well it meets the minimum and recommended requirements against a database of specific games. If you can run it, then whoop-dee-doo, Instant happiness If not, then recommendations are made on how to update or upgrade each component that doesn't meet the listed requirements. Sometimes all you need is a simple, free software download to sort things out.
The service works with Windows 98, 98SE, ME, 2000, XP, 2003, Media Center and Vista and either Internet Explorer 4.xx and higher or a Mozilla based browser (Firefox, Netscape, etc.) with Java 1.3.1 and higher. At the moment the database contains only games but there's no reason why they couldn't expand that to include other software packages. Might need a bit of redesign on the site to accommodate that though as all you get to select from is one, very long menu.