Apple spent some air time during its keynote to talk about a new feature called Continuity. For starters, AirDrop now finally works between iOS and OS X. But it's much more than that. Continuity detects devices in your proximity and makes them aware of each other.
For example, your iPad can notify you in the screen corner of your Mac and vice versa. Next, you could be compising an email on your iPhone. And when you come near your Mac, it’ll recognize your iPhone and prompt you to finish your message on the Mac.
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