Unable to open USB device

[Justin Huang]

>
> URIs of the form "usb:/dev/usb/*" are no longer supported in CUPS
> 1.2, largely because those device names are not stable, i.e. the
> number will change on you whenever you boot, cycle the power on the
> printer, or disconnect/connect the printer.
>
> --
> ______________________________________________________________________
> Michael Sweet, Easy Software Products           mike at easysw dot com
> Internet Printing and Document Software          http://www.easysw.com

How does Linux or CUPS do for mapping the form "usb:/MFG/MDL" to the physical device file "/dev/usb/lpN"?