Hamachi is software for creation of your own virtual network
Information website:
hamachigames.com
Hamachi is software for creation of your own virtual network within the internet (VPN) and when someone connects with you in such virtual net, your two computers behave, as if you were sitting in one room connected by a network cable, which brings significant advantages when e.g. connecting several PCs. After the installation you get a kind of a virtual driver, which creates new connection to the local network.