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In this paper, we present the design and architecture of an interoperable solution in order to transparently and securely access French and Japanese computing resources. The aim is to propose an international sparse linear algebra expert system available through a Web portal where a user can request some analysis on the resolution of a problem involving different kind of matrices, solvers and heuristics, and using different architectures. Hence, numerous validation studies can be performed. The solution mostly relies on the integration of a "protocol'' interoperability between the French and Japanese grid middleware DIET and AEGIS.