how do you use pfmon.exe

Tech-Archive recommends: Fix windows errors by optimizing your registry

From: donald (anonymous_at_discussions.microsoft.com)
Date: 07/07/04 

Date: Wed, 7 Jul 2004 05:45:01 -0700

I suppose the subject says it all. I cannot find a good
resource on what the output generated means. Can someone
point me in the right direction?

Thanks in advance.