In online allotment;allotment is done on the basis of CAT rank and choice filled by candidate.The candidate who get allotment are asked to pay the fees in bank and come for document verification on a specified date.While real time allotment is for those who are in waitlist in online allotment.If a candidate alloted in online allotment cancel's his/her admission his seat is given to candidate in waitlist in online allotment who come to attend real time allotment.Don't be confused as i don't think this time any online allotment is going to be done.There is no separate info about online allotment on website so very less chances of online allotment.Only rank wise 1-1000,1000-2000... detail is given.