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In virtual memory systems, a unit of data storage that is brought into random access memory (RAM), typically from a hard drive, when a requested item of data is not already in RAM.
Point-to-Point Tunneling Protocol (PPTP)
Networking technology that supports multiprotocol virtual private networks (VPNs), enabling remote users to access corporate networks securely across the Internet or other networks by dialing into an Internet service provider (ISP) or by connecting directly to the Internet. PPTP tunnels, or encapsulates, Internet Protocol (IP) or Internetwork Packet Exchange (IPX) traffic inside IP packets. This means that users can remotely run applications that depend on particular network protocols. PPTP is described in RFC 2637.See also Internetwork Packet Exchange (IPX).See also NetBIOS Extended User Interface (NetBEUI).See also virtual private network (VPN).
primary domain controller (PDC)
In a Windows NT domain, a domain controller running Windows NT Server 4.0 or earlier that authenticates domain logon attempts and updates user, computer, and group accounts in a domain. The PDC contains the master read-write copy of the directory database for the domain. A domain has only one PDC.In a Windows 2000 or Windows Server 2003 domain, the PDC emulator master supports compatibility with client computers that are not running Windows 2000 or Windows XP Professional.
