What does mean by command-and-control server? Flame Virus use C&C server to pass the information it has collected from infected host.
closed as off topic by Shane Madden, Michael Hampton♦, Magellan, Scott Pack, HopelessN00b Oct 22 '12 at 22:37
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it's name of logical role not any particular configuration of particular operating system. it means that infected computers connect to such server periodically and download instructions what to do.
in case of typical botnets c&c server can respond with: