I have a keyboard with 68 keys (I don't count the auxiliary rubber buttons), which is nice because I can reach them all without moving my hands from the home po

I have a keyboard with 68 keys (I don't count the auxiliary rubber buttons), which is nice because I can reach them all without moving my hands from the home position. I call this convenience and efficiency. I have a pointing device that I like a lot for some purposes, but I don't use it for core work, since that revolves around manipulating a bunch of symbols found on the aforementioned keys, and not found on the pointing device. I call this convenience and efficiency. vi and its descendants — actually TECO and its descendants — don't actually have ‘modes’ in the sense suggested. They have functions with arguments, and certain rules for combining these functions. What this article is trying to point out is that some of these functions take advantage of the correspondence between the symbols being manipulated and the symbols literally at the user's fingertips. I call this convenience and efficiency.