Laptops are practical because you can take them with you. However, laptops have a relatively small screen. If you work on a mobile computer, it quickly becomes annoying to constantly switch programs.

Right now, you can get a Mobile Pixel Trio to fit your laptop screen size, from a 13 or 14-inch model ($214.99; originally $259 for a single screen; $419.99; originally $500 for two screens); or the ...