Film, animation, graphic design: With the help of their Macs, New York-based Tronic Studio ignores the traditional disciplinary boundaries to deliver unique digital creations for such clients as Nike, GE, Diesel, to name a few.

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Trend Micro is researching how PCs, including many computers in defense agencies, are infected with software that can be used to mine confidential data, send spam, or launch denial-of-service attacks. But government IT managers challenge those findings, a...