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1:User View: Interoperable Web Interface accessing services through Java Compute Services Framework
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2:Network of Java Servers provide distributed services with databases, compute engines, collaboratories, object brokers, instruments
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All control at this level
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Some coarse grain computing
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Back end "Number Crunchers" linked either by communication at level 2 (slowish but easy) or at level 3 (high performance but more work)
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Compute processes linked either to servers or together by MPI if parallel
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Java Servers
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