when should I use /sbin/halt instead of /sbin/shutdown? [on hold]

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http://stackoverflow.com – I know this question has been asked a lot of times, but I didn't find an answer that satisfied me. I'd like to know when is it useful to halt instead of poweroff. When would someone say, "hey dudes, I want to halt my machine instead of powering off" ? When I halt, the console sticks with a message like "system halted" and I cant't do anything except from turning off the computer. Is there a way to resume after a halt without turning off ? (HowTos)