Ха-ха, лопухнулся. RT - это ни разу не real time. См. там --> http://blogs.wsj.com/corporate-intelligence/2012/10/26/what-does-the-rt-in-windows-rt-stand-for-nothing-andor-something/
what does “RT” mean?
Short answer: Nothing, officially.
Longer answer: Something, kind of.