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Multiple USB printers of the same type

On Oct 27 2003, Paul Danbold responded to a user's question by stating that
"Panther handles multiple printers of the same model on the usb bus. The
device uri contains the printer's s/n, and if the s/n is missing we
synthesize one from the location id. If you find any problems, please
report a Radar bug."

This response was directed to a CUPS raster printer driver, but I suspect
it applies to Tioga drivers also. I attached two Kodak 8500 printers to the
USB bus while running OS X 10.3.2. When I selected 'Add' and USB from
Printer Setup Utility, I could see two printers in the sheet. I couldn't
select and add both simultaneously, so I added the 'top' one, then the
'bottom' one, then the 'top' one again. Three 8500 printers showed up in
the printer list. However, when I sent a job to each printer queue, all 3
jobs printed on the same physical printer. Is this expected behavior?

Since Kodak would like to improve the user experience, future USB raster
printers will probably contain unique serial numbers. If so, how should we
implement this feature so Mac OS X could take advantage of it? Would we add
"SERN:<S/N>" or "SN:<S/N>" to the 1284DeviceID string? Is there something
else we should do instead?

Is printer pooling supported for USB printers with unique serial numbers?
(A fellow employee tried pooling two 8500 printers, but all jobs went to a
single printer.)
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