How to detect all windows servers in network

[Ankur Konwar <konwara () iocl co in>]

My task is to detect all the windows nt 4.0 and windows 2000/higher servers
in my WAN. How do I use nmap to detect only these two operating system
computers. What ports differentiate windows nt 4.0 and windows 2000/higher.
is there any way of diffentiating similarily between windows 2000 servers
and windows 2003 servers? 
Please help 
Ankur Konwar
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