Ruth, I was used a Com for a few years. You only used three fingers. Never the thumb or pinkie. It was clunky and had keys more like the telephone. You had to add and subtract fast to keep up with your work. You had to work all day doing the same work. Adding and subtracting sales slips and anything that needed to have a total for a person. To know what they sold or distributed to another person from a company. this is my way explaining a job I had in 1956-61. I hope this helps. I am 82 years old and in my life I have used a lot of machines to add and subtract with. My main job was double entry bookkeeping. This was an old system also. Victorine ************************************** Get a sneak peak of the all-new AOL at http://discover.aol.com/memed/aolcom30tour