In computing, the process identifier (normally referred to as the process ID or just PID) is a number used by most operating system kernels, —such as that of UNIX, Mac OS X or Microsoft Windows— to temporarily uniquely identify a process. This number may be used as a parameter in various function calls allowing processes to be manipulated, such as adjusting the process's priority or killing it altogether.
Read more about Process Identifier: Unix-like, Microsoft Windows, Pidfile
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“Because her instinct has told her, or because she has been reliably informed, the faded virgin knows that the supreme joys are not for her; she knows by a process of the intellect; but she can feel her deprivation no more than the young mother can feel the hardship of the virgin’s lot.”
—Arnold Bennett (1867–1931)