I'm trying to understand the principles and usability of Yin-Yang Release. 

Could someone help me with a few questions?

For the matter, those:

What can be done? 
What can't? 
How powerful is it? 
Who could use it? 
Why/How? 

EDIT: Just to make sure, I'm just curious of course. Not planning to use it or anything. [s]Maybe[/s]