Also, Joint Command, the multiplayer plugin, is turn based. Each player gets to command their units for 10 minutes, and they set up the AI to fight for them when it isn't their turn. Then Joint Command (JC) sends the save file to the other player, changes the side automatically and allows the other player to play.
I intentionally set it up this way because unlike some I'm a really busy guy and its tough to set up times when everyone can be in front of their computers at once to play things in real time.
I'd recommend taking a look at this thread for more info:
http://www.matrixgames.com/forums/tm.asp?m=3464981
This thread here on SubSim isn't about Joint Command, but rather about my online live stream of naval warfare simulations.
A subsim thread to discuss Command multiplayer is here:
http://www.subsim.com/radioroom/showthread.php?t=207989