Japanese company Hanwha offers an accessory that lets you write on your laptop screen as if it were a touchscreen.
Tablet or convertible notebooks have been around for a long time. Normal Laptops do not come with a touchscreen. The Duo for Laptop consists of a small sensor that tracks the movements of a pen on the laptop screen.
The device has a resolution of 600dpi and sells for about $100.
The caveat is that it only works for 15.4 inch notebooks for some reason.
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