User Manual

Psion Teklogix 9160 Wireless Gateway User Manual E-21
Appendix E: Glossary
PID
hardware means of sending and receiving data on a medium, including defining
cables, NICs, and physical aspects.
Ethernet and the 802.11 family are protocols with physical layer components.
PID
The Process Identifier (PID) is an integer used by Linux to uniquely identify a
process. A PID is returned by the
fork() system call. It can be used by wait() or kill() to
perform actions on the given process.
Port Forwarding
Port Forwarding creates a ‘tunnel’ through a firewall, allowing users on the Internet
access to a service running on one of the computers on your LAN, for example, a
Web server, an FTP or SSH server, or other services. From the outside user’s point
of view, it looks like the service is running on the firewall.
PPP
The Point-to-Point Protocol is a standard for transmitting network layer datagrams
(IP packets) over serial point-to-point links. PPP is designed to operate both over
asynchronous connections and bit-oriented synchronous systems.
PPPoE
Point-to-Point Protocol over Ethernet (PPPoE) is a specification for connecting the
users on a LAN to the Internet through a common broadband medium, such as a
single DSL or cable modem line.
PPtP
Point-to-Point Tunnelling Protocol (PPtP) is a technology for creating a Virtual
Private Network (VPN) within the Point-to-Point Protocol (PPP). It is used to
ensure that data transmitted from one VPN node to another are secure.
Proxy
A proxy is server located between a client application and a real server. It intercepts
requests, attempting to fulfill them itself. If it cannot, it forwards them to the real