There is a lot one can observe in the changes of the total combined OI across Puts and Calls .. and the divergence in their OI trends /flow indicates where bulls/bears coming in or where support / resistance levels being formed by writers confident at those levels
see the pic below to see some examples on how the interpretation is done :
MyFnO Mantras 
Thank you.
Sent from Yahoo Mail on Android
Dear Sir, I really thank you for you E-Mail post regarding #flow divergence. I am platinum subscriber to your Myfno. It is to bring to your to your notice that flow divergence is not available in my Myfno web address. I would like know how to get it. Awaiting your reply, Dattatraya Ghodke