Software makers and PC manufacturers are hoping to spur sales with more complex touch-screen systems that can recognize more than just one or two fingers at a time, reports the New York Times. "You don't even operate your TV with two fingers," said Amichai Ben-David, the chief executive officer of N-trig, which produces touch-screen technology for PC makers. "In order for this to feel really natural, you need more than two fingers for sure." HP has already been pushing touch technology to large businesses. It sells a custom touch interface for both desktops and laptops. Customers can turn these machines...

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