The concept of "second screen gaming" has gained significant traction over the last few years. It may seem like little more than a bullet point on the spec sheets of the PS4 and Xbox One, but secondary screens actually have a long history in the world of gaming. In fact, we've been using multiple screens for over three decades now. To better understand this growing trend, let's take a look at the history of the second screen, and examine its evolution in the marketplace.