Thanks - I'd not seen that before, and I think it generally covers the principle well. I don't care if a fixed function device that does its job well can be up

Thanks - I'd not seen that before, and I think it generally covers the principle well. I don't care if a fixed function device that does its job well can be updated, but I do care if something like a fridge that talks to Google Calendar ends up obsolete with nothing but a warning message on screen because it's out of date. Though why a fridge needs a screen anyway is beyond me...