Logmein, What is log me in? 

LogMeIn is a centrally-managed zero-configuration virtual private network (VPN) freeware application capable of establishing direct links between computers that are behind NAT firewalls without requiring reconfiguration (in most cases); in other words, it establishes a connection over the Internet, to create conditions very similar to that as if the computers were physically connected.

How It Works.

LogMeIn is a centrally-managed VPN system, providing a secure connection to a computer through the LogMeIn servers, whether that be your computer at home or in the office or a friends computer who requires assistance. When installing the small client application, the installation will also add a “virtual network interface” to your computer setup. This will be used purely for LogMeIn to send and receive data to and from your remote location securely while incorporating a high level of encryption.