decaff38, at Disney you're free to use the transportation to go from anywhere to anywhere. There's no ticket checking or paying money or anything like that. They just open the doors to the bus/monorail and let as many people on as want to get on. The buses all have pre-determined routes and will have a lighted sign on the front that lets you know where their destination is (ie Animal Kingdom, MGM Studios, Downtown Disney, etc)
Their are only two monorail tracks though. One goes only from the Ticket and Transportation Center around the lagoon and to the Magic Kingdom (with stops at the MK resorts). The other track only goes from the TTC to Epcot and back. Hope this helps.