It really is that easy. You give them the credit card info at the beginning of your trip, which for us was check-in at the Poly. You also give them your booklet of forms-all filled out. Then your keys are printed. They work at the hotel and on ship. They are good for charging at the hotels, the shops, the parks, and then on ship. When you get to board, just join the line for boarding, and go onto the ship. (at least that is how it worked for us). The only drawback (and it is a small one in my mind) is that your dining rotation and table are not printed on your key, so you need to go to your stateroom to get the info. Again, that's how it was with our land/sea in 10/01; some things may have changed.