User Profile

when a user changes devices, but each device is on the same iCloud account, does the currentHistoryToken supplied by CNFetchResult from the old device still work on the new device? or must we conduct a full analysis from scratch?

assume an app was launched directly into the background from the terminated/nonexistent state: is it possible to extend the time allowed to process in the background with initiating a background task? will iOS detect that an app has finished doing its business and terminate it before the expiration time claimed by backgroundTimeRemaining? can the app ever directly transition from this mode to foreground if the user taps on the app icon while the app is silently running in the background?