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From: Tim Jansen <tim@tjansen.de>
To: t.sailer@alumni.ethz.ch
Subject: Re: LANANA: To Pending Device Number Registrants
Date: Thu, 17 May 2001 18:58:09 +0200
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On Thursday 17 May 2001 08:43, Thomas Sailer wrote:
> Cheap USB devices (and sometimes even expensive ones)
> do not have serial numbers or other unique identifiers.
> Therefore some sort of topology based addressing scheme
> has to be used in that case.

No, there is another addressing scheme that can be for devices without serial 
number: the vendor and product ids. Most people do not have two devices of 
the same kind, so you often do not need the topology at all.

BTW this document describes the use of device ids on windows:
http://www.osr.com/ddk/idstrings_8tt3.htm

bye...