Page file.?

In simplest terms, I think it just uses a portion of your hard drive like RAM. Programs run in the ram in the background. You run a game that needs all the ram, but you can't just close all the windows processes, so it moves them to the page file (Virtual memory) so they aren't hogging the faster ram.

edit: http://support.microsoft.com/kb/555223
 
Page File = Virtual Memory = what happens when you don't have enough RAM. Responsible for general slowness and chugging, prevalent whilst trying to run Crysis on a Vista machine with 2GB of RAM for example.
 
Page File = Virtual Memory = what happens when you don't have enough RAM. Responsible for general slowness and chugging, prevalent whilst trying to run Crysis on a Vista machine with 2GB of RAM for example.

Even if you had 4 Gig or 8 gig of ram then it is still needed and used.
With 2, 4 or more gig of ram and Pagefile disabled you would soon have problems.
Windows was and is meant to use a pagefile(hard disk as vikrtual ram).
 
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