[acqq]

Thanks. Only after reading your response I understood.

Microsoft developed the Windows version for ARM. But then some big shot in Microsoft decided:

"No, you can't mention ARM in any name, we absolutely don't want to mention ARM anywhere in our propaganda or any other material. Our customers should not be aware that this thing like ARM processors exist. Intel promised to make something like ARM in just a year or two. Or we're going to make something. Or whatever, we just don't want to mention ARM. Verboten."

Underling1: "Oooh, how are we going to refer to the darn thing now?"

Underling2: "I know let's reuse the name that these developers use for the thing they produce, this WinRT thing. We'll call it Windows RT"

All together: "Bravo!"