Begining to trade in Minifty

Hi Guys

I am using reliance money terminal.

Today i did a test trade in minifty with one lot and gained some . But i am a newbie and want to know what to selct in Pcode column while placing order.

I get following option

NRML
MIS
CO
CNC

What do they mean. For today i selected MIS which mean i have to square of my position within today. In case i want to carry my position overnight what option to select.

Thanks
Ankur