Well, I'm surprised this thread isn't closed yet but I'll chip in.
Technically you should have a copy of FL for every computer. Originally software used to be like a book. You could make copies for archival purposes but only one person at a time could read it. Now M$ says you must have one piece of software per 'puter. What happens in reality is best left unsaid.
As for your MP ID delimma. Never heard of identical MP IDs on different computers. Nevertheless that is why you cannot play on the same server, you can't have two or more players use the same account on flserver at the same time! So they have to be different. How you do that is up to you...
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Earendil
SysAdmin of Boston Freelancer server
See
server rules and
server news for more info.