How does Windows Update know the difference?

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A

How does Windows Update know the difference between a fully patched
machine and a machine that still needs to get it's patches from
Windows Update? What mechanism causes the user's machine to be
scanned for the lastes MS patches? Is there some kind of change in
the registry? What method is used? How can I tell the difference
between an out-of-date machine and a current, fully patched machine?

Thank you.
 
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