Sure, the new MacBook Pro has that fancy Touch Bar, but some Apple laptop owners long for a machine with a full touchscreen display. A company called AirBar already gave the PC faithful a USB accessory that gives a 15.6-inch screen a more tactile function, and at CES it's doing the same for the 13.3-inch MacBook Air. The company calls the device "plug-and-touch," which means you don't have to worry about futzing with drivers before you can use the gadget.