In 2008, I met a person who had a mobility impairment. She had limited use of her arms and hands. While we were chatting, she mentioned some issues she was having with her computer. I was intrigued. How could she be using a computer without using her hands?  Hoping I wasn't being offensive, I asked her if she'd mind showing me how she interacted with the computer. To my relief, she was happy to enlighten me. The enlightenment was more like a slap upside the head to realize that not everyone uses a mouse and keyboard to operate a computer.