The return value (PID in the above example) is a process identifier.
返回值（上例中的PID）是进程标识符。
Specifies the process identifier of the process to open.
指定打开进程的进程标识符。
Retrieves the process identifier for each process object in the system.
返回在系统中每个进程的进程标识符。
Retrieves the process identifier for each process object in the system.
返回在系统中每个进程的进程标识符。
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