Min all Internet Explorer windows

Send WM_SYSCOMMAND to all Internet Explorer window. Use FindWindow function to find all IE windows.

procedure TForm1.Button1Click(Sender: TObject);
var
  IExplorer, Prev: THandle;
begin
  Prev:=0;
  IExplorer:=FindWindow('IEFrame', nil);
  while (IExplorer<>0) and (IExplorer<>Prev) do
  begin
    SendMessage(IExplorer,WM_SYSCOMMAND,SC_MINIMIZE,0);
    Prev:=IExplorer;
    IExplorer:=FindWindow('IEFrame',nil);
  end;
end;