LINK

AtomPub is another option to allow you can now log in to your blog with an AtomPub-enabled client and publish, update and delete posts and media files remotely, without needing to log in to the administration section directly. While remote posting has been possible using a number of protocols, AtomPub is a well defined protocol that should promote interoperability. WordPress's AtomPub service address is http://[Blog URL]/wp-app.php/service. Your AtomPub client should be configured to point to that address.