ACTA is a big and atrocious secret [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13], but we might soon get our hands on some new ACTA leaks. In the mean time, here are a couple of videos to remind oneself of the Treaty of Lisbon, whose nature is very different but the secrecy involved a tad similar.
From what we can gather, the tram ticketing system does not use Windows; we never saw it crashing or rebooting (or showing some Windows logo) in decades, so we assume it runs some kind of Linux