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Monitoring and steering promises interactive computing and visualization for large-scale scientific simulations. This is achieved by retrieving data about a program's execution during runtime, analyzing these data with sophisticated graphical representations, and applying changes to parameters of the simulation in progress. Based on these requirements the MoSt environment offers some novel ideas: Firstly, instrumentation of the code is performed on-the-fly during execution without a priori preparation of the target application's code. Secondly, all functionality is provided in modules which communicate with each other via a specialized network protocol, allowing the user to adapt MoSt to specific situations. Thirdly, visual representations can be generated by arbitrary visualization packages, which integrate an interface to the monitoring environment. The latter may also apply Virtual Reality techniques in order to enhance the user's understanding. This paper offers an overview of MoSt, the strategy behind it, and its main modules.