| 1 |
3-(or more)-tier architecture - Web browser front-ends, legacy (e.g. databases, HPC modules) backends; fat (1+tier) middleware
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| 2 |
Alternative / competing Middleware models:
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Java - single language solution by Sun
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CORBA - all languages solution by OMG
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COM - multi-language solution by Microsoft
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WOM/XLM - emergent solution by the Web Consortium
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| 3 |
Each model does one or other service particularly well
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| 4 |
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| 5 |
POW attempts at integrating various models and services in terms of multi-protocol middleware servers (JWORB)
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