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We gratefully acknowledge the valuable assistance of many people who have contributed to the PVM project. In particular, we thank Peter Rigsbee and Neil Lincoln for their help and insightful comments. We thank the PVM group at the University of Tennessee and Oak Ridge National Laboratory-Carolyn Aebischer, Martin Do, June Donato, Jim Kohl, Keith Moore, Phil Papadopoulos, and Honbo Zhou-for their assistance with the development of various pieces and components of PVM. In addition we express appreciation to all those who helped in the preparation of this work, in particular to Clint Whaley and Robert Seccomb for help on the examples, Ken Hawick for contributions to the glossary, and Gail Pieper for helping with the task of editing the manuscript.

A number of computer vendors have encouraged and provided valuable suggestions during the development of PVM. We thank Cray Research Inc., IBM, Convex Computer, Silicon Graphics, Sequent Computer, and Sun Microsystems for their assistance in porting the software to their platforms.

This work would not have been possible without the support of the Office of Scientific Computing, U.S. Department of Energy, under Contract DE-AC05-84OR21400; the National Science Foundation Science and Technology Center Cooperative Agreement No. CCR-8809615; and the Science Alliance, a state-supported program at the University of Tennessee.

PVM: Parallel Virtual Machine