The only documentation I have been able to find on integrating an application with the Messaging Menu is old and out of date: http://gnomejournal.org/article/67/an-introduction-to-the-message-indicator. And even that didn't have documentation for the whole API. Is there are any documentation for libindicate, either the python or C version?
Try the
libindicate-doc
package (and then look at what it installed withdpkg -L libindicate-doc
). That should contain what you need.This isn't full documentation or anything, but it may be useful http://www.kryogenix.org/days/2011/01/16/working-with-the-ubuntu-messaging-menu
The Ubuntu Platform API reference is now online at the Ubuntu App Developer site.
Also you'll find more links to documentation on the resources section for the platform documentation there.