MapTool is part of the RPTools suite of game play aids. This software allows gamers to share a game session over a network (including the internet). The possibilities are immense. With a little preparation on the GM's side, any map and encounter graphics can be used in the software with fog of war and line of sight built in. Whether the players live on opposite sides of the world or one player can't make it because it is their turn to watch the kids tonight, this software or something like it may play a role in the future of gaming. I have missed out on many gaming sessions because of long term work assignments and would have appreciated a setup like this so I could have participated.