2. It depends.
GMAPSUPP.UNL is file with unlock code(s) for maps in navigation devices (not for MapSource).
Map which is already unlocked does not need this unlock code, so you could have completely unlocked map (in MapSource - "Not lockable"),
you could unlock it in MapSource using keygen with your Device ID and map transferred from MapSource will be unlocked for your device,
or you could put unlock code(s) in GMAPSUPP.UNL file to unlock map that is not unlocked .
3. Yes it is the same. Installation of CN is just copying files to PC and registering it in registry, but BIG difference is that this one is unlocked, so if you transfer maps from this MapSource installation, you do not need GMAPSUPP.UNL.
Hope this will satisfy your curiosity.
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