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With SteamOS coming, Microsoft needs to up its game in the handheld gaming market
(www.xda-developers.com)
This is a most excellent place for technology news and articles.
It's spelled out in https://en.wikipedia.org/wiki/Xbox_system_software#Xbox_System_Software_(2013%E2%80%93present) and you can even ask Microsoft Copilot for details and it happily tells you.