There was a time, not too long ago, when the only touch-sensitive screens you could find in consumer gadgets were those on stylus-driven PDAs and tablet computers; touch-based systems were, at that point, too expensive and clunky to replace the fine-tuned accuracy of the mouse or keyboard. But then came the mass-market, stylus-driven Nintendo DS and, later, the iPhone and its multi-touchscreen – and everything changed. Touchscreens are now built into everything from mobiles to printers, GPSs, ATMs, public kiosks and coffee machines – but they aren't all the same.

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