When install printer driver via Bonjour, what information OS/CUPS communicate with printer firmware to auto-detect and find correct PPD to install?

Hi guys,
We are developing printer driver/firmware for Mac OS X 10.5 and up. Right now we have problem that  printer firmware fail to be auto detected by Mac OS 10.5 during installation via Bonjour. Could anyone teach me how the communication works between OS/CUPS and printer F/W during the installation via Bonjour? What kind information the two sides exchange?
Any input will be appreciated!

Sorry for the incorrect information. The OS should be Mac OS X 10.4 instead of 10.5

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