It does predate capacitive touchscreen keyboards. However it wasn't made explicitly for full size physical keyboards. They explicitly had soft keyboards in mind

It does predate capacitive touchscreen keyboards. However it wasn't made explicitly for full size physical keyboards. They explicitly had soft keyboards in mind. Here is the paper that introduced the phrase set [1] at it refers to this soft keyboard they made previously [2]. [1] http://www.yorku.ca/mack/chi03b.html http://www.yorku.ca/mack/chi03b.html [2] http://www.yorku.ca/mack/p25-mackenzie.pdf http://www.yorku.ca/mack/p25-mackenzie.pdf