This software lives at (accessed 18 Dec 07). Dan says it’s the orginal software, still copyright Lotus, for IBM that came out in 1981, though minus the copy protection. It runs on Windows so presumably that is in the DOS window? Is that a DOS emulator?

Dan’s had to include the reference cards too, in order for people to learn how to work it. Coming at it from an Excel background with no reference card is impossible.