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...en we shut down the VM we still need access to the journal so we can do a "diff" on what happened during testing. I know its possible to use some sort of system shim to catch OS writes, but we want to keep OS modification to a minimum. Whether we do this via some sort of shim into an OS callgate we still need to make various read/writes to the common shared image transparent / non-corrupting of the shared image. I know how to do that in Linux. You use variously overlay file systems. How do you do it in Windows. In other words, we have a very nice potential demonstration system for Xen...