What is shared GPU Memory and How is total GPU memory calculated Windows 10?

My task manager GPU screenshot

My PC specs:
1. GPU - GTX 1060 - 6GB
2. Ram - 16 Gigs
3. CPU - Intel Core i7 8750H

My task manager says that I have
1. Dedicated GPU - 6 GB (which is correct)
2. Shared GPU - 7.9 GB (shared between RAM and GPU, but how ?)
3. GPU memory - 13.9 GB (I want to know how can I use this whole thing ? if I can that is.)

So my questions are..
1. How is shared GPU memory determined ?
2. Does my RAM and CPU affect the shared GPU memory ?
3. How can my total GPU memory be used or when does it get used ?

4 Reset to default

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