How it enumerates will depend on the descriptors that you send to the system 
at 'startup' or 'restart'.

When a USB device is plugged in the host detects its presence due to a pull 
up resistor on one of the data lines. The host then interrogates the device 
to determine what it is.

All you have to do is:

(1) make the host think the device is disconnected,
(2) then reconnect it, and
(3) finally pass the host a different set of descriptors.

Steps 1 and 2 are easier to do in some USB implementations than others.

Bob Ammerman
RAm Systems


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