I had implemented some computer games in DOS. I had wanted to implement a spreadsheet, although I intended a "zoned spreadsheet", which has a zone grid (separa

I had implemented some computer games in DOS. I had wanted to implement a spreadsheet, although I intended a "zoned spreadsheet", which has a zone grid (separate from the data grid), and each zone row has a number of data rows and each zone column has a number of data columns, and some properties are then properties of zone cells and others are properties of data cells. I think this would be better than most existing spreadsheet programs. I did not know of some of the things that are mentioned there.