But basically you just to a request to the "trackback URL" of the item. From the Movable Type source code (if you value your sanity, don’t look at this, BTW) seems to also use the additional parameters title, excerpt, url and blog_name, which I assume are self-explanatory. It seems to let you do a trackback with either GET or POST, but they were too dopey to get the semantics right for GET….

Basically I think TB is silly because it’s edge-triggered and not idempotent. The right way to do this is with a bit database like the Technorati one (though ideally more reliable…). Another way to do it would be to have a <link rel="…> to indicate that you’re referring to another weblog post, and then have a database which searched those. At a minimum the people who implement TB should at least try to make their scripts drop duplicate submissions….

I already knew about Fafblog, I’ll check up on the other two.

And trackbacks, while looking nice, I don’t have a clue about them. I understand it to a point. And what I’ve read reads like mud, so I’m obviously not in the frame of mind to be reading about them, and haven’t been.