OS X is most certainly a multi-user OS. However, I don't think you can run two different user accounts at the same time. I could be wrong though.Mac OS X is not a multi-user operating system.
OS X is most certainly a multi-user OS. However, I don't think you can run two different user accounts at the same time. I could be wrong though.
Ahh, wasn't aware that a term existed for that.Did I say that OS X could not have multiple user accounts? No I didn't. On a true multi-user OS you would be able to have multiple users logged in and working at the same time. Sure you can have multiple users SSH into OS X but they don't have a GUI environment to work in. So for what the OP wants OS X is not a multi-user OS.
Wikipedia - Multi-user
Whilst you can't run two copies of the whole environment at once you can start a windowed process as another user. I'm pretty sure this didn't work in 10.4, but I just tried it and it works.
It worked! It was a little tricky to figure out the path, but there I was with two windows, one on each monitor with a different instance of the game on each. Another issue resolved.
Mac OS X is not a multi-user operating system.