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Emerging national-scale" Computational Grid" infrastructures are deploying advanced services beyond those taken for granted in today's Internet: for example, authentication, remote access to computers, resource management, and directory services. The availability of these services represents both an opportunity and a challenge for the application developer: an opportunity because they enable access to remote resources in new ways, a challenge because these services may not be compatible with the commodity distributed-computing technologies used for application development. The Commodity Grid project is working to overcome this difficulty by creating what we call Commodity Grid Toolkits (CoG Kits) that define mappings and interfaces between Grid and particular commodity frameworks. In this paper, we explain why CoG Kits are important, describe the design and implementation of a Java CoG Kit, and …