If you download the Powerloader from Vanishingpoint, you will see how the "point at" feature was used to make the pistons on the legs work on the model. You can also use the point at feature for some neat tricks, like folding undercarraige on aircraft, so that the undercarraige can have several moving parts, but you just turn one dial to retract the undercarraige, and the point at feature makes all the other parts bend correctly. (you'll see this in my upcoming mystery model)