It's hard to explain this, but if you try, let's take for example, a 3D game of some sorts released through Steam by a major developer, more often than not when you double-click to start the game, your monitor will do a little "switch" to black and come back again, ALL old games from the 90's that ran full-screen would do this, but in recent times I only really see it on the 3D games and the line, I mean, I can say right now that Duke Nukem Forever does it on my 1280x1024 4:3 screen, I'm just not sure what to call it when the screen does the "switch" to black briefly, and when you run a Scirra (or even MMF) game it never does this, it just goes fullscreen like a Youtube video does (obviously, it's HTML5).