Handoff will be one of the coolest features of OS X Yosemite and iOS 8, letting you seamlessly transition between workflows on the two platforms, but unfortunately for owners of older Macs, it will require Bluetooth 4.0, which excludes Macs built before 2011, and even many built later. Peter Cohen of iMore explains how to check which version of Bluetooth your Mac has. If your Mac isn’t compatible with Handoff, a USB dongle that provides Bluetooth 4.0 may enable Handoff by Yosemite’s release. follow link
Enable Apple TV Subtitles
While a video is playing, hold down the Select (center) button on your Apple TV remote to bring up the Options menu, then choose the Subtitles view. If there are embedded or external subtitles associated with the video they will appear in the list. If you are using Silver Screen to AirPlay video to the Apple TV, it will dynamically extract the subtitles and send them to the Apple TV.
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OS X Yosemite’s Handoff Will Require Bluetooth 4.0