"OS-level CPU" is just normal CPU that's been configured and handed out by some program (conventionally, the OS) for other things to use. If that initial proces

"OS-level CPU" is just normal CPU that's been configured and handed out by some program (conventionally, the OS) for other things to use. If that initial process management program (call it an OS) also supports communicating with similar setups and receiving/dispatching jobs and queries then that's precisely the distributed OS you're looking for. You could _also_ architect a comparable system as user-space networking on top of a conventional OS, but that's by no means required.