>Does this mean the URL can change from one day to another? - I suppose yes.

No, the current structure will stand. It is just that before it wasn't structured and this didn't provide us any flexibility. The only think that changes in the URL is the article ID. But, that is normal.

>Well, I guess I will just have to tell friends to search by edition, by article, etc.

I am revising some posts right now in the Universal Thread. I already have adjusted a bunch a while ago but discovered that I missed a few. I am fixing them all presently.