An interactive problem solving environment that couples high performance computing with large scale visualizations. In such systems the end user can "steer" the numerical calculations and interactively visualize the results and change boundary conditions of the numerical simulations.

The architecture of such systems will be presented (as a live demonstration) illustrating the capabilities and benefits of such systems. Remaining challenges will be revealed and how these present limitations are influencing activities and research within the Cardiff School of Computer Science and the Welsh e-Science Centre.