Embedded USB


I'm looking at using the Renesas H8SX1664 processor that has on board usb,
and I have a couple of questions.

As a slave:
What process do you need to go through to get vendor and product IDs? Are
there generic IDs that anyone can use? What approvals are necessary?

As a host:
I realise that writing a usb stack isn't trivial, but how easy would it be
to write the code for a very limited host that only knew about one type of
device?

Thanks

Dan
.