A downloadable on-screen keyboard, ‘OnScreensKeys’ from onscreenkeys.com (last checked Aprol 2020).
This virtual keyboard is available in many different languages and alphabets. It is easy to switch between different languages. It has built-in word prediction. The size is adjustable. Used with a mouse; the user has a head mouse, see related tip.
OnScreenKeys also has a computerized mouse click function that allows the user to click without using the click button. There are other downloadable on-screen keyboards, such as cnt.lakefolks.com (last checked April 2020).
The user prefers OnScreenKeyboard.
Downloadable from onscreenkeys.com (last checked April 2020)