how to detect internet idle time?

how do i detect internet idle time(time since i used internet) using delphi something like:

begin
{ idle time detection code goes here}
showmessage('you have not browsed an开发者_运维问答y websites or downloaded/uploaded 
for over xyz seconds');
end;

thanks in advance

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Internet idle time, or network idle time? For network you can periodically check outgoing packets and reset the idle time variable.

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Define internet idle time.
Then try WMI, for instance by checking your NIC info using WMI.