On: A dead man's switch for your computer?

[Plough_Jogger]

Carrying a beacon in your pocket seems like a really impractical solution if you own a smartphone.

[stinos → Plough_Jogger]

Even then I would still consider it somewhat impractical as it means battery dead = computer locked. And depending on how it's programmed: forgot beacon/phone = computer locked.

[basisword → Plough_Jogger]

Just a guess but it would surprise me if his phone isn't the beacon.