How to find out trent

how to find out Trent, entry point and exist point in commodities market . is there any relation volume and open interest to find out Trent

Dear Renjith, 

I'm assuming you are referring to a trend and not trent. If its actually trent, then please ignore this answer because I'm not sure what that means. 

As far as the relationship between OI, Volume, Price is concerned, I've summarized the same for you.