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PROS
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It follows the industry-proved standard of three-tier model.
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Developing back-end WebFlow modules and their front-end controls can be achieved independent of each other.
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It supports session concept for each working user that doesn't interfere with each other.
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Module developers don't need to deal low-level issues such as allocation computing resources and connection of modules.
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It allows configuration and instantiation of multiple WebFlow servers
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The architecture of WebFlow midller-tier was very well designed with three servlets : Session , Connection and Module managers.
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