design of nmap

[Kaushik Das <kaushikdas24x7 () yahoo co in>]

Hi,
    Can someone throw some light on the software design of nmap in general. 
  
    Specifically, my question is - 
      nmap is a single threaded application. How does it transmit and receive packets   simultaneously?
  
   Thanks in advance,
   - Kaushik.
  
   
  
       
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