[CentOS] CentOS default accounts in /etc/passwd

[Paul Stepowski <paul.stepowski@xxxxxxxxxxx>]

Hi,

I've noticed that the /etc/passwd file on CentOS 4.4 contains the users: 
sync, shutdown, and halt.

The users' shells are set to /bin/sync, /sbin/shutdown, and /sbin/halt 
respectively.

What are these accounts used for?

Thanks,

Paul
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