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Several manufacturers, including Hewlett-Packard, are evaluating ways to use an offshoot of the Universal Serial Bus 2.0 specification called USB On-the-Go. Using it, a person could plug a handheld or digital camera straight into a printer to produce a photo. PDAs also could swap documents directly or back up data by connecting directly to a portable hard drive. The technology is also expected to be used in cell phones and MP3 players.