The autoscoper application windows contains:
Two "camera" panels were you can chose between three view options: perspective (showing the virtual space with image planes, cameras and the bone), x-ray camera 1, and x-ray camera 2.
The "tracking" window were you can see keyframes, traces and the timeline.
The 'view" panel were you can adjust the DRR renderer settings and apply filters to the the x-ray images.
Shortcuts and keys:
Ctrl + scroll - zoom in and out of camera view
Ctrl + left mouse buttion - pan camera view
hold d - move pivot
h key toggles bone DRR on and off
S - create keyframe
right-click render name to add filters
right-click filter to optimize