A Verbal Prehistory
In an earlier stage of my eyesight I did a lot of zooming in on the screen. My set up was such that the magnified portion of the screen followed the mouse cursor most of the time. I would use Control-2-finger scroll on the trackpad to zoom in and out. While this worked fine, it forced me to use both hands to accomplish the maneuver. Ugh! I felt like a caveman, having to set down my coffee just to navigate with two hands. :-)