Operating System (OS)
The dispatcher

never changes task priorities
None of these
actually schedules the tasks into the processor
puts tasks in I/O wait
is always small and simple

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

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

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Operating System (OS)
Scheduling is

None of these
allowing jobs to use the processor
unrelated to performance consideration
the same regard-less of the purpose of the system
not required in uniprocessor systems

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