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At present, Microsoft seems to be calling the API for creating Metro style apps on Windows 8, “Windows Run Time”; it is also being called WinRt.
We already have two tags for this: windows-runtime and winrt. We only need one!
My vote is for winrt. This is what Google says, and what everyone appears to be calling it.
I vote windows-runtime. IMHO, it is a lot more likely that the average user would know what that means than winrt.