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

the command set being common across different hardware configurations
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
None of these
users can create system programs and run them as commands

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Operating System (OS)
A co-processor

Is quite common in modern computer
Causes all processor to function equally
Is relatively easy to support in software
Works with any application

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