It's not easy to use a PC if you have ALS or another neuromuscular disease that prevents you from using your hands. You can use eye tracking, but that could easily entail specialized software and an imperfect experience. Microsoft thinks it can do better. It's adding built-in eye tracking to Windows 10, nicknamed Eye Control, that will let anyone navigate using their gaze. You can launch apps, type and otherwise perform common tasks just by focusing your eyes on the right part of the screen.