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We describe the Gateway computational web portal, which follows a traditional three-tiered approach to portal design. Gateway provides a simplified, ubiquitously available user interface to high performance computing and related resources. This approach, while successful for straightforward applications, has limitations that make it difficult to support loosely federated, interoperable web portal systems. We examine the emerging standards in the so-called web services approach to business-to-business electronic commerce for possible solutions to these shortcomings and outline topics of research in the emerging area of computational grid web services.