Option (a) Posted into the wrong tread my mistake
Option (b) Thought that the OP he was quoting was suggesting only buying 1 $69 license instead of a family pack for use on multiple Macs and thought that there might be a lock-out if they were used on the same network.
Option (c) Your guess is as good as any other because it makes not much sense at all!
Option (d) Who cares?
He was talking about what happens if you use the same copy of office xp in the same location on 2 computers