Are you sure you actually mean RPC and not IPC? Windows RPC (Remote Procedure Calls) uses its own implementation of DCE RPC which is generally not compatible with others. COM is implemented using Windows RPC, and so are a lot of Windows services (usually invisible to end-users). Although I have seen DCE RPC implemented on other systems, like Linux, personally I have never been able to get it working with Windows (that might have been me, of course).
IPC (Inter-Process Communication) is much simpler, depending on what you want to do.
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