I heard that in order to get into the MGM pool complex you have to have a room key. Ok that's fine, I will be staying there and will have a key for me and my wife will have one. The question is, will I be able to get my brother and his girlfriend into the pool (they are staying at Monte Carlo)? Does evey single person need to have a key? Do they scan the key and see names of people registered for the room and check your ID? How difficult will it be to get them into the pool area with us? I guess I could always ask for another key from the front desk and say I lost 1, until I have 4.