4G memory

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I have 4G physical memory install with a windows 2000 professional. Here is
my qustion:
1) When I check the memory from system and task manager, it only show about
3.4G. How can I make rest of them available?
2) I need to run some application require large memory. Is there a way to
get more than 2G for a process in 2K?
3) If I run the application with 2 CPUs, it will be considered as one
process or 2?
4)To optimize the system, should I minimize the virtual memory or make it
larger?

I read something about /PAE and /AWE, but I got myself confused.

Thanks
.



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