nmap os detection!

["Prathap R" <prathap.r () indiatimes com>]

hello all,
         i just used nmap to detect the os on the network. out of curiosity,i want to know if there is a way of making 
the OS undetectable. it will be of great help if anyone could point out how do it?. i am using both windows and linux.
thanks in advance.
regards,
       Prathap



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