There’s not much I can add to the explanation and discussion of the Trackback system. Other than this: I’ve always thought of Trackback as the calculus of the weblog work — a set of concepts so completely foreign to me as to exist beyond the realm of understanding. And thus best ignored.
Today, though, something snapped, and I suddenly understood Trackback perfectly, probably because I had an opportunity to use it.
If you have behaved like me, and run scared from Trackback in the past, I suggest you revisit it. I’m going to implement it fully, both coming and going, on the homebrew blogging platform I call home.