' is a formulaic greeting. ' is a more modern formulaic greeting. Some people feel no need to respond to it.
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roky0071How do you?This doesn't express anything. We don't use this.
roky0071How are you doing?If I had to classify it as a 'state' or an 'event', I'd say it's a state.
roky0071How are you doing?If somebody asks me that question, my response, more often than not, is Fine. Is Being fine an action? Certainly not.