PPTP : Point-to-Point Tunneling Protocol. PPTP is a protocol that allows secure transmission of data in TCP/IP packets. PPTP protocols are used to carry secure communications over Virtual Private Networks that use public phone lines
Young & Company Electric Power Products and Related Engineering Services, Glossary of Electrical Terms, http://www.youngco.com/young2.asp?ID=4&Type=3, CA., USA 2001. (Electr Sfty - Amer) {514}