Is it possible to dual-boot my TF201 with Windows RT?
Windows RT is based on entirely different system altogether - right from the bootloader up to user interface.

Also, Windows RT is proprietary so there is a fat chance that the code would be available to make it work. 

What about:


booting mechanism
kernel
drivers for the chip-set support


There's far too many to mention, and quite possibly would require a re-write for it to adapt to the Asus TF02! :)

This is equivalent to asking if Apple iOS can be loaded on a Android handset and vice versa, in plain simple word, the answer is No - nigh on impossible and there would be so much hackery to get it to work, let alone boot.