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We developed a platform independent, three-tier system, called WebFlow. The visual authoring tools implemented in the front end integrated with the middle tier network of servers based on the industry standards and following distributed object paradigm, facilitate seamless integration of commodity software components. We add high performance to commodity systems using GLOBUS metacomputing toolkit as the backend. We have explained these ideas in general before, and here for the first time we describe a fully operational example which is expected to be deployed in an NCSA Alliance Grand Challenge.