Actually I was thinking of prisoners of the Japanese in WWII. As I said, the Nazis were hardly the only ones to number prisoners, and I suspect the phenomenon has more to do with <i>technology</i> than with the supreme evil tidily ascribed to losers of wars.<p>I&#x27;m making a general point about identifiers and protocols. The same thing applies to client MACs, which are obviously being used to track phone users with wifi on. Obviously MAC addresses can be cycled, but that takes active diligence. If the protocol had simply been designed to eschew and hide such identifiers in the first place, the entire issue wouldn&#x27;t even exist.