I'm having a hard time understanding what this is and the page does a poor job of explaining it. The only question it answered was, "wait, so does this mean any

I'm having a hard time understanding what this is and the page does a poor job of explaining it. The only question it answered was, "wait, so does this mean anyone can develop games for Xbox consoles?" The answer is, "No, not without access to the NDA'd extension that lets you do just that." OK, so what does this let you do then? interact with Xbox services (friends, leaderboards, achievements, etc.) on Windows?