Hamachi : Stay Connected: “With Hamachi you can organize two or more computers with an Internet connection into their own virtual network for direct secure communication.”
Hamachi is a zero-configuration virtual private networking application with an open security architecture and NAT-to-NAT traversal capabilities.
I installed Himachi on two of my machines to test. Both machines are Windows XP Pro with SP2 and all the latest Microsoft updates. The installation was a breeze. When you launch Himachi for the first time you will be presented with a walk through system that help you configure the system. This took me less than 5 minutes. Whoa! One of the machines I used for testing is a Dell Inspiron 2600 with a LinkSys WUSB12 wireless NIC. I temporarily “borrowed” a wireless connection from a neighbor and was successfully able to create a VPN connection back to my home network and access files on the second machine. I plan to create a VPN between my in-laws machines. Supporting them will be that much easier.