How do you make 2 screen game

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If you can do it, you can do it. But honestly, I wouldn't know why someone would want to have such a thing instead of having all the options accessible from within the running game. They may be a neat addition to equivalent in-game options, but shouldn't be the only way to go.

Here, you'd use files to safe your options and configurations. These files would be editable by your configurator program and would be read by the game.