A Virtual Private Network (VPN) allows the creation of a secure private network over a shared public network infrastructure such as the Internet. A VPN provides a set of services to facilitate transparent and secure communication for all forms of network traffic regardless of the application.
How to guides
Windows Internet Connection Sharing (ICS) in Windows Vista and Windows 7 is not compatible with the VPN client. If you attempt to install the VPN client with ICS activated, you will receive the error "The vpn client agent was unable to create the interprocess communication depot." Please see the Microsoft website for instructions on how to disable Windows ICS