A Discovery and Cautious Optimism

Just for the heck of it, I decided to log in to both games using the same login ID -- the one that works -- and I made an interesting discovery.

1. First, I logged in to one machine and created a session using System Link.
2. Then I logged in to the other machine with the same ID and joined that session.
3. On the first machine, I got an message that said I had been disconnected from the LIVE service.
4. However, both machines went into the lobby, and both IDs were listed.

So now the question is whether I can get by using the same ID on both machines as long as I use the System Link option.  Time will tell.  I'm moving forward with this approach for the time being.