Microsoft Windows
Under Microsoft Windows operating systems, one can get the current process' ID using GetCurrentProcessId API, and ID of other processes using GetProcessId API. Internally, process ID is called a client ID, and is allocated from the same namespace as thread IDs, so these two never overlap. The so-called System Idle Process is given process ID 0, and System Process is given process ID 4.
Read more about this topic: Process Identifier
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