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If you don't mind, would you please provide some background as to why those two questions are relevant?
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Tom may have covered this in his comprehensive reply above which I don't have time ATM to go through.
It's been 10 years since I studied this, but I do recall that there was an NEC provision that if there was a circuit that included any grounded path between the outbuilding and the main building, then there were specific things that had to be done. Don't recall the exact particulars, but I seem to remember that a proper current carrying neutral and ground had to be run between the structures, the bonding jumpers had to be set correctly in the subpanel, and grounding rod may or may not have been required. Like I said, it's been too long so someone feel free to refresh my memory as to NEC requirements.