Single CAT file for multiple INFs

[muriwai]

Hi,

I have a driver package that consists of multiple INFs for different classes
(e.g. SCSI Adapter and CD-ROM). The binaries for the same device are
different for x86 and x64 but have the same file name in different source
folders. The drivers are NOT class drivers but functional ones.

Can I use a single CAT for all my INFs and drivers? I have some doubts
because I can see the device identifier from the first INF file embedded
into CAT.

If I need multiple CATs, does Microsoft charge their WHQL signature fee per
driver package or per CAT file?

Thank you