It is believed that next generation grids will extend the application domain to include interactive graphical sessions. The authors term such grids interactive grids. This paper describes some of the challenges involved in building interactive grids. These include fine grain access control, QoS guarantees, and dynamic account management. In order to architect interactive grids, this paper proposes and describes I-GENV, an environment for enabling interactive grids. I-GENV consists of GISH- 'Grid Interactive Shell', Controlled Desktop, SAC-'Session Admission Control' module, GMMA-'Grid Monitoring and Management Agents', System Policies, and Dynamic Account Manager. The paper also presents the testbed implementation of I-GENV using and extending Globus Toolkit 2.0 for the Grid middleware infrastructure, and VNC as the remote display technology.
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