In Windows Phone 8, when the user navigates away from an application, the app goes into suspended state and the state preserves in memory by the operating system. If the user re-launches the app by tapping on the app’s primary tile from the Start Screen or the app name in the app list, the old instance of the app terminates by default and a new instance of the app generates. Windows Phone 8 introduces an ability for apps to request that user actions to re-launch the app to resume the suspended instance of the suspended if exists. This process is called Fast App Resume or FAR.
