This has been a very gradual project for me, and its still not quite finished, with custom functions and variables still yet to come. Still, it is a massive improvement on the last one. Basically, it is 200x20 pixels, and fits in the bottom left corner of my screen (movable), where it is always there for whenever I need it. And not just for quick sums either. I have tried to mimic propertys from other calculators such as MS powertoy one, and have got a nice long list of functions (mostly buil