Questions about IBM PureFlex Systems

This may be a dumb question but I cannot find the answer any where on the internet.
 
I was asked if software running on IBM i 6.1 install and run the same way on an IBM PureFlex System.
 
I have zero experience with a PureFlex System, so I tried to do some research and learn exactly what the difference is between a Power System running 6.1 and a PureFlex System. Results was a lot of "it's great blah, blah blah, it's great blah, blah blah..."
 
So my questions are
Where is the best place to learn exactly what a PureFlex system is in basic terms.
Will software running on PowerFlex System IBM i 6.1 run on PureFlex System?
 
In simple basic terms is a PureFlex System the same as a Power System running IBM i
(example: you signon the same, you save lib, restore lib and the software just runs the way it always has) 
 
Mark