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I have a function that detects the if a PCI BIOS is present are not and works correctly.
I can use the function FIND_PCI_DEVICE (0xB102) to detect if a device is present are not. This device is described by a DeviceID and a VendorID.

But how do I know these to ID values ? 0xFFFF seems to mean "ANY ID".
And how do I know what kind of device it is ?

I'm not sure whether what you are asking is this but, check this website, you might find something useful.

http://www.pcidatabase.com/vendors.php?sort=id

this is what I was looking for.
I also get this URL be looking at alt.os.development.