Actual Multiple Monitors is an AMAZING program for this.
And when you're in game you can click CTRL+SHIFT+ALT+I and click to the other monitor without minimizing your game.
Will that prevent games from needing to minimize when you click to the second monitor in Windows 10? I was told I can run the game in windowed mode, which is fine in CS:GO because it has the option for fullscreen window mode, you can't tell the difference. But DOD:S has the window bar and it bothers me. Otherwise, when I scroll over to the second monitor, and click something, the screens both refresh (flash black) and the first screen minimizes the game.