Someone used to have a one-handed keyboard that was one half of a standard QWERTY keyboard. (You could choose which half.) They also had a software version that worked with standard keyboards. You could access the other side by holding the spacebar and typing the corresponding position for the desired key. For example, if you had the right-hand keyboard, while holding the spacebar, you would type 'L' to get 'S'. I was amazed how easy it was to use. I guess if you are a touch typist, you know which finger to use on the missing hand and use the corresponding finger on the hand that was present. Brainz are kool.