How ScanPort program know ?

How ScanPort Program know which is NT, which is win98, which is win95, which is win2k ?
How about Unix Platform ?

RGDS.
leumasAsked:
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Ghost_HackerConnect With a Mentor Commented:
It can tell based on how the packets it gets back from the target are "made up" (called "tcp fingerprinting").


This page explains how "nmap" performs this:

http://www.insecure.org/nmap/nmap-fingerprinting-article.html

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