I created RF Workbench back in the early 1990s, before Windows dominated personal computers. Over about two years of coding every night and weekend, I alone wrote every line of Turbo Pascal code. It included features not found in the vast majority of DOS programs, including a fully graphical user interface, drop-down menus, movable windows, extensive error trapping, 3-D graphs, and detailed Help screens. I even wrote the mouse and printer drivers.