Ponyboy is cool. I like his style and his book has a beautiful collection of photos. It's all the same horsemanship though. Like someone else said, 'join-up' is just what Monty calls it. Buck calls it 'hooking on'. Same technique. All you have to do is create some energy in the horse and then direct it. It's one of those things that takes awhile to get good at but the technique itself is simple. The confidence in your intent, basically, is what determines how effective it will be when you practice it with the horse.