iOS 5 revamped notifications, adding temporary banners that appear at the top of screen and introducing the Notification Center, a central location for all recent notifications. The operating system also added iCloud, Apple's cloud storage service for synchronization of content and data across iCloud-enabled devices, and iMessage, Apple's instant messaging service. For the first time, system software updates can be installed wirelessly, without requiring a computer and iTunes. iOS 5 also featured deep integration with Twitter, introduced multitasking gestures on iPads, and added an easily accessible camera shortcut from the lock screen.