Operating System (OS)
Feed back queue

are very easy to implement
dispatch tasks according to execution characteristics
require manual intervention to implement properly
None of these
are used to favor real-time tasks

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

None of these
flexibility to the users in running lists of commands by simply collecting them in named batch command files
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
users can create system programs and run them as commands

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