PPTP servers are servers with routing capabilities that are connected to a private network and to the Internet. In this document, a PPTP server is defined as a computer running Windows NT Server version 4.0 and RAS. PPTP is installed as a network protocol. During installation, PPTP is configured by adding virtual devices referred to as virtual private networks (VPNs) to RAS and Dial-Up Networking configurations. For more information about PPTP server installation requirements, see the document “Installing, Configuring, and Using PPTP with Microsoft Clients and Servers.”