Hundreds of US industries save money by using PVM to exploit the aggregate power of networked computers to solve their large science, engineering, and medical problems. PVM (Parallel Virtual Machine) is a software package developed at Oak Ridge National Laboratory and the University of Tennessee that permits a collection of computers ranging from PCs to Crays to be used as a single large parallel computer. Thus companies and research labs can solve large computational problems more cost effectively by using the aggregate power and memory of existing computers. PVM enables users to exploit their existing computer hardware to solve much larger problems at minimal additional cost. The source, is available free through Netlib, and with thousands of users, PVM has become the de facto standard for distributed computing world-wide. PVM is considered the most cost effective application for parallel computing, and PVM won the 1994 R&D 100 Award for being one of the most technologically significant products of the year. Over 250,000 requests for PVM have been received including from companies such as: Ford, Boeing, Sikorsky, United Technologies, Texaco, Dupont, General Electric, Citicorp, Compuserve, JP Morgan Guaranty Trust, Siemens, Exxon, TVA, Computational Biosciences Inc., Western Geophysical, Phillips Laboratory, Mobil Oil, Consolidated Freightways Inc, US Grain Marketing Research Lab, Elegant Mathematics Inc., IBM, Cray Research, Convex, and Shell Oil. For more information about PVM, link to URL: