Windows RT is a ARM build of the Windows operating system as we know it. It even has the familiar desktop but it is closed to run only Microsoft Office (on Surf

Windows RT is a ARM build of the Windows operating system as we know it. It even has the familiar desktop but it is closed to run only Microsoft Office (on Surface RT tablet). Users may only install "Metro-style" apps. It is shrunken to include only those components of Windows that Office requires. But one can still start the familiar Command Prompt, Windows (File) Explorer etc. It's very much the familiar Windows we all know.