I write. Sometimes it’s software, for which I have a battalion of performance-focused machines. But sometimes it’s words, and that’s a different matter. Performance doesn’t matter so much, but portability suddenly becomes key – and indeed endurance. Two different scenarios, each with their own overriding concerns. If I tried to select a machine to cover both, my options would be limited to terminally constrained products, where the designers just threw their hands up in the air. I’d end up with something that performed each task at the expense of the other. What I actually need (and have) are two different devices. A very simple realisation, but one that we tend to forget.