  Grappa is a Grid portal effort designed to provide physicists convenient
access to Grid tools and services. The ATLAS analysis and control framework,
Athena, was used as the target application. Grappa provides basic Grid
functionality such as resource configuration, credential testing, job
submission, job monitoring, results monitoring, and preliminary integration
with the ATLAS replica catalog system, MAGDA. Grappa uses Jython to combine the
ease of scripting with the power of java-based toolkits. This provides a
powerful framework for accessing diverse Grid resources with uniform
interfaces. The initial prototype system was based on the XCAT Science Portal
developed at the Indiana University Extreme Computing Lab and was demonstrated
by running Monte Carlo production on the U.S. ATLAS test-bed. The portal also
communicated with a European resource broker on WorldGrid as part of the joint
iVDGL-DataTAG interoperability project for the IST2002 and SC2002
demonstrations. The current prototype replaces the XCAT Science Portal with an
xbooks jetspeed portlet for managing user scripts.
