It is like a secret Santa gift exchange with others on the cruise. You sign up through the message board and exchange information. You'll be given details of everyone in the group and any specifics to preferences or allergies. You can decide to give a gift to the whole cabin or to each individual, the choice is yours. Here is a link to a gift idea thread.
You will make or buy a pocket organizer to hang on the fish hook that is outside of your cabin door. Most will make one pocket per person in the cabin. If you google or search on this board, you'll find a lot of pictures.
This sounds like so much fun! Has anyone ever had an issue with items being stolen from their pocket organizers?