This PidRef just track some data, but cannot be used for any active operation. Background: for https://github.com/systemd/systemd/pull/34703 it makes sense to track explicitly if some PidRef is not a local one, so that we never attempt to for example "kill a remote process" and thus acccidentally hit the wrong process (i.e. a local one by the same PID).
System and Service Manager
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