Yes, and I never implied its not hard to do. And examples such as this one are quite impressive - which is what got me interested in Rebol in the first place an

Yes, and I never implied its not hard to do. And examples such as this one are quite impressive - which is what got me interested in Rebol in the first place and triggered the development of Ni. However... if I understand your code properly - you are basically generating an argument declaration by scanning for "get words". So its still a static declaration. In Ni an arg word is an operation. That means a Ni func can decide how many arguments to pull, and in which order, dynamically, much like stack oriented languages can do. Usefulness? Dunno :) But its not the same. Also, yes, I opted out of set words in Ni since I want to be able to have keyword syntax á la Smalltalk/Self. And I use "^" instead of ":" prefix for get words, because I wanted the argwords to be similar to how they look in Smalltalk. :)