If you have two separate reservation numbers then you will have to do online check in for each reservation. If you have two rooms booked under one reservation number then you only have to do check in for the one reservation. You should have a button on the reservation in your MDE account that tells you whether you are checked in or not.I have 2 rooms booked. If I do online check in, does it apply to both rooms or to only the room that I am assigned?