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You use email to send messages and Web pages to share information. But to swap ideas with colleagues or provide service to customers, you may need real-time chat. Until recently, though, the only real power-users of the technology were teenagers obsessed with sex and celebrities, and university professors interested in debating with colleagues from around the world. Not even ardent chat enthusiasts expect that the technology will ever become as ubiquitous as email. But it is going mainstream.