I\'ve seen all the posts here on stackoverflow about posting status updates to a page\'s wall (not a user\'s wall); but all appear to be out of date as none of them address the
Open Stream API's official release was two days ago. That explains the lack of tutorials.
If you specified a session_key, and that session user is a Page admin, then you can specify a Page ID here to publish to one Page for which the session user is an admin.