How does the 4 gigabyte address space map to a computers physical memory?
Windows controls physical memory resources (RAM and the paging file) and carefully allocates these resources. Applications are granted access to physical memory resources only as needed, not in advance. When an application requests more memory, Windows maps some physical memory (as long as some is available) into the process’s address space. In essence, the virtual address is linked to a physical memory address. Windows maintains several tables that keep track of all of this, and the application knows only about the virtual memory address. If both RAM and the paging file are completely full when an application needs more memory, an error will occur because of memory exhaustion. In theory, it is possible for multiple applications to each request enough memory fill their entire address spaces. In practice, no server would be able to satisfy all those simultaneous requests. How much memory does Exchange need? Exchange is a very scalable application. It can be used to serve a few dozen cli
