As a user with multiple iOS devices, I have hated iOS 5’s handling of notifications across multiple devices with my very bones. Get a notification and read it and clear it on your iPhone? It’ll still be waiting for you on your iPad and your iPod touch. Someone call the Department of Redundancy Department. It’s just irritating.
Luckily, with iOS 6, Apple seems to have figured it all out. Now, as long as it’s an iOS 6 stock app, if you read a notification on one device, it’ll be whisked off your other devices magically, presumably through iCloud. Which is an interesting point in and of itself: will Apple soon be oiffloading all of their Push Notifications to iCloud?
Via: Apple ‘N’ Apps