A hacker claims to have found a method in the code integrity mechanism in Windows RT, that allow one to bypass security mechanism preventing unauthorized software running on ARM-powered Windows RT tablets. Windows RT is a special version of Microsoft Windows designed for lightweight PCs and tablets that are based on the ARM architecture. One needs to inject a blob of ARM code into a safe spot of RAM and have the Windows RT kernel divert the processor momentarily to run these instructions. On PCs the variable contains ‘0’ allowing any program to run, whereas it is ‘8’ on Windows RT devices.
Source: https://thehackernews.com/2013/01/running-desktop-apps-on-windows-rt.html