Is computer attached to a network?

Here's a code that will check if a computer is attached to a network

~~~~~~~~~~~~~~~~~~~~~~~~~
procedure TForm1.Button1Click(Sender: TObject) ;
begin
   if GetSystemMetrics(SM_NETWORK) and $01 = $01 then
     ShowMessage('Computer is attached
                  to a network!')
   else
     ShowMessage('Computer is not
                  attached to a network!') ;
end;
~~~~~~~~~~~~~~~~~~~~~~~~~

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