DVORAK keyboards
In one of the books which came with my computer (a Gateway) equipped with WIN98, there is an appendix entitled "Accessibility for People with Disabilities", with this note: "Keyboard Layouts for Single-handed Users: Microsoft distributes Dvorak keyboard layouts that make the most frequently typed characters on a keyboard more accessible to people who have difficulty using the standard 'QWERTY' layout. There are three Dvorak layouts: one for two-handed users, one for people who type with their left hand only, and one for prople who type with their right hand only. ... The two layouts for people who type with one hand are distributed as Microsoft Application Note GA0650."

I'm not at all sure what the word "layout" means here. I had assumed it's a new keyboard with the keys rearranged, but maybe they mean you use the same keyboard but add a software routine which tells the computer that the keys have different assignments, like what you have to do to use a Cyrillic or Hebrew font.