volume nse futures

I understand that in India we have futures upto 3expiries, so say we have F1, F2 and F3. F1 denotes the front month, F2 second month and F3 third month. My questions are 1) Once F1 rolls off or expires, it seems F2 becomes the new F1, F3 becomes the new F2, and a new F3 is introduced, is that...