Put the save folder on a shared drive, mount it locally, and coordinate to ensure you aren’t playing at the same time? Alternately, keep it stored remotely and download a local copy before play, then upload afterwards. More of a hassle that way, though.
Another option would be to have one of you set up a server and the other play remotely.[/quote]
I did this with my friend: we had the map saved to the local drop box folder in each of our machines, which would then update any changes made on an identical map stored on a drop box server. Any changes I made to my local map (when saved) would be reflected on the one hosted by drop box and then subsequently to my friend’s locally saved map, effectively allowing us to play on the same world at the same time.
For visual aid, a change would look like this, starting with a change to my map:
Game(me) > LocalMap(me) > SharedMap(dropbox) > LocalMap(friend) > Game(friend)
All we had to do was not cross reality bubbles and auto-save semi-frequently to insure an identical map. This allowed us to visit places where the previous person was not too long ago, including player bases.