My understanding is only recent macs with bluetooth 4.0 can use the Continuity/Handoff features which is kind of a bummer since it's one of the big updates. I'm wondering if buying a [bluetooth 4 dongle like this](http://www.amazon.com/Inateck®-Bluetooth-Wireless-Compatible-Playback/dp/B00N2E3ZHG) will make this work or does it have to be Apple's built in bluetooth receiver?
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