Are they asking about the health or the development of the persons?
Often, these sentences are just like saying 'Hello'. In other words, there is no real inquiry or interest involved. I might just respond with 'Fine', or even just 'Hi'.
Are they same meaning with " how are you?" becuase some people say " how are you ?" refers to asking about the health but " how are things and how is it going " asking about the work or life. Is it correct?