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Requests either a specific or all components to shut themselves down. All components except libraries and the Launcher should listen to this message. When the parameter matches its component ID or 'all', it should shut itself down. Before exiting, the component needs to send out a vrProcEnd with its own ID as parameter. Note that, unlike vrComponent, no second parameter is present, therefore all sub-modules should exit when receiving the kill request.
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All components except libraries should implement listening to this message.