The last three years have seen the transition from isolated personal computers to universal Internet connectivity; now in Europe and the USA we see supercomputing centers joining into ever-larger geographically distribute collaborations. Taking these facts together, it is clear that supercomputers and parallel computers will soon become part of a global computing fabric, where some users will not be aware of the architecture or the location of the machines executing their jobs, and other user may construct vast distributed metacomputers with groups of nodes providing hetero- geneous services to some central objective.
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