Column: Apple users can now 'knock' on iPhone to unlock Mac

If you are an Apple devotee with both a Mac and an iPhone, there is a cool new way to use both in tandem. Knock, a new app, allows you to unlock your Mac with just two taps on your iPhone.

It’s pretty simple, but it seems just magical in the promo video. And it isn’t just a parlor trick. Compared to the tired old process of typing passwords, it’s actually more secure. Knock uses Bluetooth Low Energy to detect your Mac so the battery doesn’t drain completely, and only works when you yourself are around. Paired with a fingerprint-scanning iPhone 5S, you have a pretty foolproof security setup.

Full story at Minyanville.