Protocol Network
Protocol, network (NETWORK) to establish communications and send data format standard. Each protocol has more than one rule to address how to send information on how to identify the destination, how to handle error conditions, how to compress data, etc., Some of the protocol is the use of other protocols as the exchange of information with other computers, the rules themselves are dealing with a particular task.

PSTN Public Switched Telephone Network
Public switched telephone network, using copper wire to transmit analog (ANALOG) voice telephone system. PSTN, also known as POTS.

PURL Persistent URL
ONLINE COMPUTER LIBRARY CENTER from the website maintained by (URL) conversion system, when a user use the PURL to read a web page (WEB PAGE), when, PURL server in accordance with the actual URL of the requested web page to read data back to the user . PURL will maintain a database to correspond to the relationship between the PURL and the URL, when the Web page to another URL, the user can read through from the PURL to a copy of the information, without having to look for URL.

PVC Permanent Virtual Circuit
Connection is established and has been a valid virtual circuit (VIRTUAL CIRCUIT), relative to the SVC end of each transfer after the completion of the virtual circuits. FRAME RELAY Network (NETWORK) the use of PVC to connect two hosts (HOST).

Python Programming
A by the interpreter (INTERPRETOR) the implementation of object-oriented programming languages (OOPL), free access to the source programs.