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function IsConnectedToInternet: Boolean;
var
dwConnectionTypes: DWORD;
begin
dwConnectionTypes :=
INTERNET_CONNECTION_MODEM +
INTERNET_CONNECTION_LAN +
INTERNET_CONNECTION_PROXY;
Result := InternetGetConnectedState(@dwConnectionTypes, 0);
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
if IsConnectedToInternet then
ShowMessage('Connected.')
else
ShowMessage('Not Connected.')
end;