Operating System (OS)
...... controls the way in which the computer system functions and provides a means by which users can interact with the computer

The operating system
The motherboard
Application software
The platform

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Operating System (OS)
The advantage of a command processor running only built-in commands is:

the processing is much faster than would other-wise be the case when user defined commands are used
flexibility to the users in running lists of commands by simply collecting them in named batch command files
users can create system programs and run them as commands
None of these
the command set being common across different hardware configurations

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