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The Grid and Cloud User Support Environment (gUSE), also known as WS-PGRADE (Web Service – Parallel Grid Run-time and Application Development Environment) /gUSE, is an open source science gateway framework that enables users to access grid and cloud infrastructures. gUSE is developed by the Laboratory of Parallel and Distributed Systems ( LPDS) at Institute for Computer Science and Control (SZTAKI) of the Hungarian Academy of Sciences.

A relevant requirement in the development of gUSE was to enable the simultaneous handling of a very large number of jobs, even in the range of millions, without compromising the response time at the user interface. In order to achieve this level of concurrency, the workflow management back-end of gUSE is implemented based on the web service concept of Service Oriented Architecture (SOA).