(1) (n.) (Packet Internet Groper) A small program (ICMP ECHO) that a computer sends to a host and times on its return path.
(2) (v.) To test the reach of destinations by sending them an ICMP ECHO: "Ping host X to see if it is up!"
PIR
Peak Information Rate
PPA
Primary Point of Attachment
Presentation Service
Term used to describe a service that "presents" the data that is returned to the end user. In this context, the presentation service was delivered by a tier of Web servers that served up JSP/servlet traffic for viewing by the client Web browsers.
Protocol Manager
Enables communication between Sun ONE Application Server and a client. Manages and provides services for all active, loaded listeners. Supports HTTP, HTTPS (HTTP over SSL), and IIOP.