Computer I know that from the mode of address to start, this time to read and write the physical address, if you want to open protected mode you have to fill out the page directory and a page table, want to fill in the visit, this time is empty, should be read and write the physical address to fill in?

Above is the boot time of doubt, and boot after the question, when start notepad, Windows will assign it a physical page, the virtual address and physical address mapping, this to notepad filling process is to use virtual or physical addresses to access a page table?

And each process has its own page directory and page tables, Windows is how to control each process mapping table, in order to prevent their mapping physical page of conflict, the cover?