Not all B2B cruises are the same for TAD. That's why the TAD letter and the TAD meeting are important. When @Tlbecker1said, "Everyone needs to be off of the ship until you can check back into your 2nd cruise" means all non B2B cruisers have to be off before the TAD process can be completed. If you plan on getting off the ship on TAD, make sure you get your in transit passes. This allows you to reenter the ship without any delays. You still have to go thru security. Again all this will be explained in your TAD letter/meeting.