What is HR Instance Seperation?

Hello all,

I Want to know what is HR instance Seperation?

What all activities need to be done in HR Instance Seperation?

How to do it? what are the various ways in which i can transport data between my HR system and production system at runtime.

If anyone can let me know about HR Master data distribution tool and ALE, it would be great.

I need to do it in my next Assignment so i need to know everything about it.

Please do reply. Points would be rewarded.

Thanks