While there was a previous hack which allowed you to run unsigned applications on WinRT devices it would not survive a reboot and so needed to be reapplied.  A programmer at XDA Developers has created a similar and improved tool which functions as a limited 32bit x86 emulator on WinRT.  Once you unlock your device and install the software, which is still in beta, you will be able to run a number of older games and a number of simple applications.  One thing it cannot do at this point is launch an x86 program from within an emulated x86 program so some installers will not function if they rely on decompressing and launching a second program.  Check out the latest version of the software and the FAQ by following the link from Hack a Day.

"It seems with a lot of black magic, [mamaich] over at the XDA Developers forum has a solution for us. He’s created a tool for running x86 Win32 apps on Windows RT. Basically, he’s created an x86 emulator for ARM devices that also passes Windows API calls to Windows RT."

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