GWM used lisp as an extension language too. I've heard people compare Tcl with an ancient version of lisp that worked in a similar way (i.e. by string substitu

GWM used lisp as an extension language too. I've heard people compare Tcl with an ancient version of lisp that worked in a similar way (i.e. by string substitution). Viaweb was written in lisp, could "end users" extend it in a way analogous to emacs? The next time I need to build in an extension language into something, I'll probably end up using Lua.