Quick question for everyone. We are booked for Alaska this summer. My parents and aunt also are booked under their reservation, and our reservations have been linked to be sure we're seated together. When it comes time to book excursions and dining reservations onboard, it appears that being linked any one of us can make reservations for the excursions and dining for the whole group?? Will the computer allow me and one of my parents to be online booking at the same time for excursions, since they are planning some different ones than we are? Thanks!