How to detect a remote device type

[seaman kwok <seaman.kwok () gmail com>]

Hi ,
    As we known , we can detect a remote OS using '-O' parameter.
eg.'nmap -O 172.16.1.1' . And I found the tech article in
http://nmap.org/book/osdetect-methods.html .
   The algorithm seems too complicated and it take about 10s for detecting
one IP in my local network.

   So, my question is : Is it possible to detect whether a remote device is
a PC?

Thanks and Best Regards,
Seaman
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