>At 10m even challenge/response with an active tag is interesting. Is there
>a guarantee that the targets appear one by one ? Is there clutter in the
>area (equipment, lights, other people, moving machinery) ?

How is it done on those things that are supposed to be able to read a trolley
load of groceries that have a transponder in every packet? I have seen items on
TV where these are demonstrated, but do not know of it being used commercially
yet.

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