The ViewSonic VG1457 is a portable dual-monitor that provides extra screens for professionals who require more screen space for operating outside their office s

There are a growing number of laptops with dual screens designs, or a single large display that folds in the middle. But for the most part these laptops cost a lot more than a typical single-screen notebook. You know what's cheaper than paying for a dual-screen laptop to get extra screen space? Buying a portable display - you can find plenty of decent models…