Englebart’s classic “Mother of all Demos” has him using a mouse in his right hand and a one-handed chording keyboard in his left hand. USB mice are cheap, plug

Englebart’s classic “Mother of all Demos” has him using a mouse in his right hand and a one-handed chording keyboard in his left hand. USB mice are cheap, plug two in, one on each side. Makes it easier to use non-dominant hand occasionally without having to move the mouse around.