> user-programmable externally to any given application I think this is why it reminded me of TCL, specifically the "expect" command that can script apps that

> user-programmable externally to any given application I think this is why it reminded me of TCL, specifically the "expect" command that can script apps that know nothing about it. From the Wikipedia page, the TCL Expect extension: "automates interactions with programs that expose a text terminal interface". So how I imagine this "Emacs as an OS" paradigm you're describing, is that it mediates interactions with any and all apps that expose a text input/edit interface, to allow programmatic customizations. Like I'd love to script my own shortcuts for Firefox (or other apps) - possibly with multiple steps, taking input from some config file, or sending a link to another app.. Or, as you mentioned, Emmet-style expansions that work in any input field or textarea..