System class
The system class uses a fixed priority policy to run kernel processes
such as servers and housekeeping processes like the paging daemon.
The system class is reserved for use by the kernel; users
Priorities for system class processes are set up in the kernel code
for those processes;
once established, the priorities of system processes do not change.
(User processes running in kernel mode are not in the system class.)
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Fixed priority class
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SCO OpenServer Release 6.0.0 -- 05 June 2007