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On Thu, 13 Dec 2012, John Doty wrote:

> You miss my point: the fact that the info isn't generally available is part of the confusing design of the tool.

It is not available when it gets invalid (change in the netlist). This is 
a more theoretical question, not an implementation detail of PCB. Could you 
propose a solution for that, assuming your dream-PCB remembers anything 
you want and represents copper the way you want?