They came from Paris, Taiwan and, yes, Cupertino, Calif., to participate in the tech Be-In known as Macworld. They came Mac-equipped — there are probably more MacBook laptops and iPhones per square foot at the Moscone Center in San Francisco this week than any other spot on Earth. The unlucky few seen lugging around Dell notebooks, on the other hand, are quietly sneered at. “It’s like coming to Mecca — the Macca,” said Trevor Macdonald, a junior from the University of Utah.