It is simply a service to update DNS. There is no need for it to run in
the background. Therefore it's launched on bootup in runlevel S. But
just to be sure, I installed it on one of my computer and guess what, no
more DNS ! I don't know about you but since it doesn't do me any good I
prefer to remove it rather than learn how to operate it (at least for
now).

Here is short explanation from <http://ubuntuforums.org/showthread.php?t=89491> 
:
runlevel S: the first runlevel in boot process. /etc/init.d/rcS script will be 
invoked to start and all the processes underneath /etc/rcS.d will be executed.
runlevel 1: the single user mode. All processes underneath /etc/rc1.d will be 
executed.
runlevel 2,3,4,5: in debain system, the multi-user env, may not may not include 
GUI. The same, processes under each of the corresponding dirs will be run.
runlevel 0: computer shutdown.
runlevel 6: computer reboot.

-- 
No DNS at computer start
https://launchpad.net/bugs/54115

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