Enabled with the use of advanced, wide-angle camera (s) or the screen itself will be able to detect hand & finger locations.
This will work with websites using ancient code.
You will not need to touch the screen, unless you want to.
People who have used a Wacom or other modern digital drawing tablets with a pen device know this effect already. The pen tip does not need to touch the tablet surface.
We are talking fingers and thumbs here, not stylus pen device.
This is the next killer app.