"Game Profile X" is a viewer for your "XBox Live" gamer profile. Enter your gametag
then press the search button to load your profile. From the profile screen you can go
on to your friends and games played lists. You can also view the achievements you've
earned for each game.

The app uses the REST APIs from www.xboxapi.com to display profile information. Check out this site if you want to learn more about the data.