Playing Age of Empires on Internet or among different subnets

Since the hostels of IIT Roorkee got Wi-Fi internet connectivity, the search for ways to play popular games like the Age of Empires and Counter Strike among different hostels began. But the main problem is that each hostel is in a different subnet so the direct IP of the host machine cannot be used to join the game. After a tiresome search, we came across a software called Hamachi, that facilitates the creation of LANs among hosts that are in different subnets or behind a NAT (Network Address Translater). Using it is also quite simple - just install it and create a network that others can join.

What I'm most impressed with is the technology that goes behind it. It assigns a private IP in the range 5.x.x.x to each node when the node first communicates with the Hamachi server. Consequently, the other members of the virtual Hamachi LAN can use this IP to access the machine. It uses UDP hole punching (similar to peer-to-peer funda) to establish direct communication between the various virtual LAN nodes. I tried finding some research paper or patent by Hamachi, but couldn't. If someone knows more about this, please mail me at amiacs[at]gmail.com .