Explanation/Reference:
Explanation:
http://technet.microsoft.com/en-us/library/gg699365.aspx
How to Manage User Device Affinity in Configuration Manager
You can define primary devices. These are typically the devices that users use on a daily basis to perform their work. When you create anaffinity between a user and a device, you gain more software deployment options. For example, if a user requires Microsoft Office Visio, you can install it on the user's primary device by using a Windows Installer deployment. However, on a device that is not a primary device, you might deploy Microsoft Office Visio as a virtual application. You can also use user device affinity to predeploy software on a user's device when the user is not logged in. Then, when the user logs on, the application is already installed and ready to run.