Often, the user ID can be substituted in commands that take a user's login name as a value. See also user number . A parameter that specifies the user ID under which the application or transaction program runs. Contrast with user name . The hardware, software, or both by which a user communicates with a system, program, or device.
Examples are a keyboard, mouse, command language, or windowing subsystem.
A mode in which a process is carried out in the user's program rather than in the kernel. Contrast with kernel mode . A string of characters that uniquely identifies a user to the system. Contrast with user identification . A number that uniquely identifies a user to the system.