User Device Affinity (UDA) is a way of associating users with one or more devices in ConfigMgr 2012. This can be defined by you as the administrator, by allowing users to define it via the Application Catalog, or by using threshold settings.
A hidden feature is that even if you don’t have the UDA threshold setting enabled (User and Device Affinity section in Client Settings), it is still collecting the data. You can view and manage this data via the Manage Affinity Requests wizard.
This wizard is only available when you are viewing the Device Collections. If you are viewing any specific collection, it will not be available to you.