I've used those for many hacks. To this day there is one on my desk, with the arrow keys adjusting audio volume, with 'tick' and 'x' keys for mute/unmute. The d

I've used those for many hacks. To this day there is one on my desk, with the arrow keys adjusting audio volume, with 'tick' and 'x' keys for mute/unmute. The display shows date/time/audio volume and email counters, with a 60s blip to the name of the person calling when the phone rings.