Physical and Virtual Id's

 Dear Support,

Kindly explain about the following points in detail :

1. Can we attach Ph Wh Id to Items in RMS ??

2. Does RWMS contain Vwh id's or Ph Wh id's?? If it's Ph Wh id, What is the reason to have Ph Wh id's ?? 

3. Can we create a Virtual Wh without Physical Wh??  Kindly Explain on YES/NO scenarios.

4. What are the operations we can perform from Both Physical and Virtual Warehouses.

5. To which location we point an item , that is to Physical or Virtual WH Id??

Thanks in Advance!!!