[MSDN Library June 1998] Configuring PPTP Filtering on the PPTP Server (45.2248804927376%)
MSDN Library Visual Studio 6.0 > Windows Resource Kits > Windows NT Server 4.0 Resource Kit > Windows NT Server Resource Kit - Supplement 2 > Installing, Configuring, and Using PPTP with Microsoft Clients and Servers > Adding VPN Devices as RAS Ports on a PPTP Server