Call Of Duty Modern Warfare 2 recover gamer tag?

How can i use the classes i use at home at a friend's house?Call Of Duty Modern Warfare 2 recover gamer tag?If the classes you use are the online ones, just recover your profile and remain connected to Xbox Live at your friend's house. If you mean that you want to use the offline or private classes that you can't use online, they you have to manually move the data for those classes from your system to your friend's because that data isn't stored on the Xbox Live profile.Call Of Duty Modern Warfare 2 recover gamer tag?You can only use custom classes that you created online on Xbox live by recovering your gamertag.