Why only 3.2GB Memory

[Khalil]

I am very curious why Windows XP professional is limited to 3.2 GB memory. What is it intentional? Was it a design flaw? Was it design limitation?
XP X64 can use 16GB of memory, what is the difference?
I hope this is the right place to ask this question.

[Cricket]

The 4GB Windows Memory Limit: What does it really mean? (http://www.brianmadden.com/content/content.asp?ID=69)

:) Cricket

[Khalil]

Excellent link Cricket. Thanks a lot.