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Detexify is the only practical use I've found so far for the touchscreen on my laptop! The paper's on stuff I did for undergrad research ages ago that just never got published. We wanted to see if we could detect static shocks to a computer using only software running on the computer and it turns out that yes you can probably do that, although it's tricky. Looking back on it I wish we had had better experimental methodology but fortunately the project's been revived in a slightly different form so hopefully my dreams will come to pass.