Google's Smart Lock system for Chrome OS is one of those things that sounds spectacular on paper but then frequently falls flat in the real world.

You know about Smart Lock by now, right? It's something Google created to turn your Android phone into a contact-free key for your Chromebook: Anytime the phone is close to the computer, Chrome OS will automatically detect its presence — and as long as the phone is unlocked, the laptop will let you skip the usual password prompt and hop right in with just a quick click on the sign-on screen.

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