Knock-knock
Who's there?
Steve
Steve Who?
Unlock my (#$&(#$ iMac, OK?
Sure!
Take out the cursing and that's the idea behind Knock, a pair of apps (free for Mac, US$3.99 for iOS) that lets you unlock your Mac by simply knocking twice on your iPhone. You don't need to even take the iPhone out of your pocket -- rapping twice on the device, even through your favorite jeans, types in your password and unlocks your Mac. No more sitting down and typing your 11-character safe password -- just knock twice.
The app works on just
