You cant MULTI-TASK. Say that you decide to watch a 3D movie. You've got the glasses on, and you cant do something else at the same time, such as look at a Tablet screen on your lap, or write something on a notepad as you're sitting on the couch. Well you CAN, if you really want to, but its an awkward experience. A tablet screen or anything else looks darker through the glasses. I can get around this by simply looking down through the opening at the bottom of the glasses. But when I do this, I'm missing out on something 3D on the screen. Once you put that 3D movie in and put the glasses on, thats the only thing you can do for the next 90-120 minute duration of the program, to really get the full 3D experience. Unless its eating and drinking, the food just looks darker. Thats why if I REALLY have to multi-task while watching a movie, I'll put the 2D disk that comes with the set in. The 3D technique Nintendo used for the 3DS doesn't require glasses and allows your eyes to multi-task.