Here is a short video explaining the the use of a servo programmer. I mainly use the programmer just to set the center point of a servo before installing the servo in the truck. The programmer can also be used with digital servos to set endpoints,speed and torque in the servo it's self if you don't have a programmable radio. I use the HiTec just because that is my preferred type of servo but there are programmers for other brands.
Pics
Video
http://www.youtube.com/watch?v=c3OiL...1&feature=plcp
If you have any questions feel free to ask and I will try to answer them.
Travis