With the upcoming TRIO from MobilePixels, laptop users will soon be able to benefit from multi-screen setups, just like desktop users. Besides the obvious advantage offered in games, a dual or triple-screen setup can also improve productivity and multitasking. The TRIO module attaches via magnets on the back of the main laptop screen and only needs USB cables.
https://www.notebookcheck.net/MobilePixels-announces-dual-and-triple-laptop-display-setups.427029.0.html