The Room can be accessed only by the person who has the Key. The Key will open any hinged door with a pin tumbler lock anywhere in the world, turning that door into a portal accessing the Room regardless of where it would normally open into. As Joe Miller sees on the surveillance tape, when a door is opened using the key, it appears closed if viewed from the other side of that door. When exiting the Room, its door opens not necessarily to the original place of entry, but to any room the holder of the Key has in mind, or to a random room if the user does not focus. To reach a specific room the user must have a clear picture of the room's door and the area around it. The "Lost" Room thus serves as a means of instant travel between similar doors anywhere on Earth. Hinged doors with types of locks other than a tumbler lock or with no lock at all, sliding doors and rotating doors cannot be used to access the Room. The door used does not have to be installed in a wall and can be a smaller prop door or a freestanding doorway; the only important elements are the lock and that it be a hinged door.