I believe the gforth manual contains a fair bit about its implementation and design decisions. For threading, this is probably a good start: https://www.compla

I believe the gforth manual contains a fair bit about its implementation and design decisions. For threading, this is probably a good start: https://www.complang.tuwien.ac.at/forth/gforth/Docs-html/Threading.html#Threading https://www.complang.tuwien.ac.at/forth/gforth/Docs-html/Thr... EDIT: I don't know how well you know Forth, but it's probably a waste of time trying to implement it before you grok it from userland, if that's where you are. Understanding first the concatenative paradigm and then (more importantly) the deep metaprogramming runtime-is-a-fundamental-part-of-your-application paradigm (which Forth shares with Lisp and Smalltalk) is super important