Usage:
Simply install, launch the application and open halo demo.
When hosting a game, the program should automatically sync your map to the server. If it doesn't, try showing the leader board.
When joining a game, simply double click on a synced room (doesn't need to be) and it should automatically do it's thing.
To resync with a room:
Leave the room
Join another room
Leave that room
Join the original room again.
Or just simply relaunch halo...
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The program doesn't work very well for LAN games.
Please note that this probably won't work at all on your machine. It should in theory, but I doubt it will

Screenshots:

Let me know how it goes =)