Private free-space communication.

[Karl]

>
> I have long thought that designers of WiFi routers should have
> incorporated an ability to communicate between nearby units.  The vast
> majority of WiFi routers are within hearing distance of other routers.
>

This is called "mesh" and is now in use in some areas, mostly from
non-profit-oriented hackers doing the initial r&d.

>
>
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