It’s a pretty simple idea, and not unique. According to Hamachi’s site: "With Hamachi you can organize two or more computers with an Internet connection into theirown virtual network for direct secure communication." But the devil is in the details… And the details are good.
Hamachi is very, very slick. Available right now for Windows and Linux (OS X promised "soon"), Hamachi sets
up a VPN between to machines lickety-split. Just as advertised, it’s a zero-configuration VPN. What’s more, it can
simulate up to 5 network cards, and gives you an IP starting with 5— allowing you to pass through a firewall.
It’s like your LAN on the internet, all with as little fuss as possible. Take it for a spin and let us know what you
think in the comments.