[lch]

Since this was an issue that I had myself when I started hosting games and had to set nations to AI where I was playing in myself, let me tell you the same info that can be found from JK's or KO's mouth elsewhere on the site here:

Just like you can play hot-seat games with as many nations as you want on the same local machine at the same time, you can play more than one nation in the same game in multiplayer. What you really NEED to make sure is that you DON'T install and use the game with the same key on different systems, though. If you e.g. try to play one nation with a Mac and one with a Windows machine, it won't work. If you play both from the same machine, then it will work. To find out more tips on how to set up your machine for multi-nation playing, search for DOM3_SAVE or DOM3_CONF on this forum and read the threads that you can find by that.