Everyone permissions

From: adam (chihai_at_charter.net)
Date: 06/14/03 

Date: Fri, 13 Jun 2003 17:03:35 -0700

I am aware that WIN2K comes with the default persmissions
set to everyone. What type of security risk is this? Does
it allow for just anyone to have access to the computer
even if the domain requires a user name and password?