While a keyboard certainly isn’t always useful with your iPhone or iPad, keyboard shortcuts certainly are. With iOS 7, Apple has introduced the possibility for third-party developers to support custom shortcuts with external (Bluetooth) keyboards in their apps. Keyboard shortcuts, longtime favorites of OS X power users, can now be enabled in iOS apps. Apple itself has been experimenting with keyboard shortcuts in built-in iOS 7 apps.
An overview of such keyboard shortcuts can be found here.
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