It's called X10.  It's been around for a long time.

On Wed, Mar 16, 2011 at 7:56 PM, steve harley <[email protected]> wrote:
> On 2011-03-16 12:53 , Joseph McAllister wrote:
>>
>> A cry perhaps for a central computer in the home to maintain all settings
>> of all appliances, allowing their power to be cut completely when not being
>> used. Therefor allowing complete restoration when each is re-activated.
>>
>> Providing, of course, that the central computer, and the wireless
>> circuitry such a system would demand, was actually a net savings of power.
>>  :-)
>
> what would make this possible is a communication protocol for all devices,
> similar to the protocols being developed for automobile electronics, which
> vastly simplify the wiring -- any device can be plugged into the power
> supply anywhere in the vehicle, and it responds to messages on the power
> line telling it to turn on/off or modulate ...
>
>
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