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By Craig Crossman, Computer Column Knight Ridder/Tribune Business News

Sep. 17--There's one peripheral that's been around for almost as long as some of the more popular devices you can hook up to your PC, but for some reason it hasn't made it into the "every computer has one" category.

Everyone who uses a computer knows what a mouse is. They also know about printers, modems, CD and DVD drives, monitors, speakers, scanners and Web cameras. Just about every computer out there has most if not all of these devices attached because they are among the most co

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