The user controls his computer with a keyboard and 2-finger system, see related tip. The keyboard is equipped with a keyboard overlay (a thin sheet of metal or plastic that sits on top of the keyboard) that makes it easier for the user to hit the right key. The wheelchair joystick is programmed so that it can also be used as a mouse for the computer. The computer has a mouse button utility program called Dragger 32 (see photo 3). The user also has an external click button for left click; see related tip.
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It is also possible to control the computer using an on-screen keyboard, such as https://spinalistips.se/tips-on-screen-keyboard-en-1282.html
This tip is from 2014