Wordpress Atom Publishing Protocol/XML-RPC documentation?

Is there doc开发者_开发技巧umentation on using these protocols anywhere? I can't seem to find any and searching for tutorials, they're basically non-existant.

Any idea where I should start looking?

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Try to start here: http://codex.wordpress.org/XML-RPC_Support.
Here are described the functions to use: http://codex.wordpress.org/XML-RPC_wp