Fervent computer gamers and the detectives on “N.C.I.S.” do it, but I had no plans to add a second monitor to my computer system — not until I bought an upgraded video card for my PC and noted it had output connections for two monitors. Once I saw that, I could not resist dusting off my old 14-inch monitor and plugging it in along with my new 19-inch L.C.D. Recent Windows and Mac computers (and some Linux systems) can operate with multiple monitors; with my computer’s Windows XP operating system, it took only a few keystrokes and mouse movements to set things up. Once I saw how it improved my productivity, I was an instant convert.
Site – http://www.nytimes.com