If you are just using Windows, it will not use the radeon card by default. Games should use the radeon.
There are settings in the Catalyst Control Center where you can change which card is used for certain applications. If you want a game to run on the radeon card and it isn't, you can change it there.
Here's a tutorial from HP on how to change the settings:http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c03048374