Universal Windows apps enable you to target every Windows device in one solution. You develop once, share most of your code, and deploy on Windows, Windows Phone, or Xbox. The goal is to maximize the reuse of code.
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Creating Your First Universal Windows App
Universal Windows apps enable you to target every Windows device in one solution. You develop once, share most of your code, and deploy on Windows, Windows Phone, or Xbox. The goal is to maximize the reuse of code.
Full article