Zdravei
        The hardware address of a network card (also known as mac
        address, ethernet address) is usually burned into the *ROM of
        the netword card. Some of the new cards (especially those
        built into the motherboard) allow one to change the value
        of the hardware address.

        For all practical purposes, the need to change the hardware
        addres can be addressed at a purely software level because
        the network card (usually) by itself does not perform any 
        function involving the hardware address.. (i.e. it doesnt
        send anything over the wire by itself)

        The software responsible for handling the bits coming in
        through the wire can be fiddled around with to change the
        hardware address easily. (under linux, one can use ifconfig)

        Some of the interesting things one can do: (listing only one :-) )

        * Listen on multiple hardware addresses at the same time.. that
          is one machine can be made to appear as n machines..
          (no.. I am not talking about multiple IP Addresses)

        
        If there is still confusion regarding hardware address, think
        about where is it used (and why)  and where are the packets 
        constructed and all...

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