PRH - Probability of begin sent to Right Handler

PRI - Primary - Rate Interface

PRINTF - Print with Formatting

PRISM - Photo - Refractive Information Storage Material

PRIT - Project Risk Information Template

PRJ - Project

PRM - Protocol Reference Model

PRM - Project Risk Management

PrM - Process Modeling

PRMD - Private Management Domain

PRML - Partial Response Maximum Likelihood

PRN - Printer

PRO - Profile

PROBE - Proxy - Based Estimating

PROFS - Professional Office System

PROLOG - Programming Logic

PROM - Programmable Read Only Memory

PROTest - Program Test Environment

PrtScr - Print Screen

PS - Proportional Spacing

PS - Process Specification

PS - Postscript

PS/2 - Personal System Two

PSA - Parallel Signature Analysis

PSAPI - Presentation Space Application Programming Interface