In Chicago we used this for a while and found it quite useful, but we switched computers, lost the program and never got it back running. I will ask Roy to comment on this as well, but basically the GAS static program takes a close look at the static trail and helps check static alignment and marker placement. It is a good way to check your work and also get some valuable information about the patient's static standing posture.
We also used this for awhile for marker placement competencies.