Is there a visual tool running on Windows that lets me display CPU load etc on Windows and Linux machines?

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http://serverfault.com – I would like to have a real time visual status screen displaying the current CPU usage (and possibly memory consumption) for a number of remote machines. These machines will be reachable only using TCP (not UDP etc) and the graphical client will need to run on Windows. Does anyone know of such a tool? (HowTos)