Here's an example of what's available for future implementation in apps. It's already available in some Apple apps but it's available for any third-party developer that wants to join the "party"!
QUOTE("gunug's ars link")
Handoff takes aim at the difficulty of transitioning between devices while continuing to work on the same task. Imagine you’re composing an e-mail on your iPhone as you ride to work on the train. You arrive at the office, but the e-mail isn’t complete. You’d like to sit down at your Mac and finish the e-mail on your big, comfortable keyboard.
Most people reading this know it’s possible to save a draft of the outgoing message on the server and then launch Mail on the Mac, sync with the server, find the saved draft, and resume typing the message. To fully understand Handoff, you must accept that Apple thinks this perfectly functional interaction is not good enough, that it contains too much friction and too many steps.
Assuming you’re using a Handoff-capable e-mail application like Apple’s Mail on iOS and OS X, here’s how the same task could be accomplished. Upon arriving at your desk in the office, the Apple Mail icon appears in a single-item mini-dock to the left of the real Dock (or on top, if your Dock is on the side of the screen).
Obviously, this is more code than was in
Mavericks, ,ore than was in iOS 7, and there will also be bits in any app that wants to use it. It also requires Bluetooth low energy hardware, none of my hardware has that, but the code is already in the iOS/OS X. Read that 25 "page" article for more details like this. Do these things make
Yosemite a "RAM hog"?
Is this functionality worth carrying around extra code? Even if you can't use it? Fortunately, Apple is doing a much better job of not simply loading every last byte of the OS just because you turned on your Mac...