I got my dispatchers license back in 1997, the ATP written and the Dis. written are exactly the same except for about 7 more questions that are just for the dis., and you should take the ATP written right after that while it is fresh in your head. You will have to take a course to get signed off to take the practical, when I was going to Embry-Riddle, they offered the program, it had certain parameters that had to be met, I had to have a perfect attendace in the required classes, which where ones already taken in my Degree program, and I had to add a Air Traffic Controllers Class, great class to my studies, then you get a sign off, then you go to a designated examiner to take the practical, I took mine at the examiners house, it lasted 4 hours, you pick the aircraft you want to use to do it in, I choose the B727 since I was very familiar with it at the time, you will do weight and balance, read weather charts, and you will get about 2 hours worth of systems questions asked at you, you have to know as much as if you where getting a type ride, this stuff is all required since dispatchers have to know their aircraft, I think that you had a choice of either the B737, or the B727, then that is it, and the license does not expire good for life