Not entirely sure what they are supposed to do, but I do know that if superdish is checked on a legacy receiver It will run the test 1 of 6 instead of 1 of 38 (or 34 on some very old legacy receivers). On Dish Pro receivers I have noticed that with Superdish checked if you either have legacy equipment, or there is a DiSEqC Communication problem with Dish pro, it will run a the test as 1 of 50 instead of 1 of 38. To the best of my knowledge and experience having the either checked or unchecked on a dishpro system really makes no difference in the reuslts, or operation.