No, I guess the best way to describe it is as you have shift held down and are dragging up and down an axis you can hover over another distant point and the co-ordinate of that point is read into the inference system and will 'lock' to it, so now the two points will have the same value along that axis. 'A' is clicked, 'B' is hovered over and now 'A' inherits 'B's value along that axis (and are now aligned in the axis being dragged along.) 'C' would be the distance in which the geo jumps and is now aligned, it's just a great feature in SkUp IMHO which allows you to align anything really in the perspective view.

// Rich