JORG KELLER, PhD, is an associate professor of computer engineering at Universitat Hagen, Germany, investigating the use of commercial microprocessors in PRAM emulations. CHRISTOPH W. KELER, PhD, is an assistant professor in the computer science department at the University of Trier, Germany. His primary research is on the design and implementation of parallel programming languages. JESPER LARSSON TRAFF, PhD, is a research staff member with NEC Europe Ltd. He has worked extensively on the PAD library for the SB-PRAM while at the Max-Planck-Institut fur Informatik, Saarbrucken, Germany.