documentation available at:
https://secure.logmein.com/products/hamachi/howitworks.asp
Note from the Licence:
This LogMeIn Software and Service are subject to the United States Export Administration Regulations. No Software or Service may be downloaded, used or exported into (or to a national or resident of) Cuba, Iran, North Korea, Sudan, Syria, or any other country to which the United States has embargoed goods. By checking this box, you represent and warrant that you are not and are not controlled by a national or resident of any such country.
