I used to work for a manufacturer of mainframes in the 1970s. The installation guys told me about upgrades. They would carry in big sealed crates. They would put paper over any windows in the doors etc. The crates would be opened to reveal food and drinks, books and magazines. They would open up the mainframe and flick the 'double power' or whatever switch, set some tests going and have an enjoyable relaxing day.<p>Plus ça change.