[flurdy]

Some time there was a similar tool that locked the computer via bluetooth if you walked away from the desk with your phone. It didn't unlock it which is fine, but it seems a better way to lock a computer if you forget rather than a timed screensaver after x minutes which leaves the computer vulnerable until then. (Mostly just from colleagues changing your wallpaper, or autocorrect...)

[jpalomaki]

Windows 10 has this feature [1]. Would be more useful if you could tune the required signal strenght.

[1] https://support.microsoft.com/en-us/help/4028111/windows-loc...

[jfb]

There used to be a Mac app called "Bluephone Elite", IIRC, that could do this for a very specific group of phones. It worked with my Sony Ericcson thing BITD.