How to create Today widget host application

Hello everyone,


Apple has a Today widget technology, that allows developers to craete plugins. These plugins can provide views into the Today section. Experimenting showed that crashes inside the Today widget do not bring the entire process down, but only the single widget that is crashing stops working. Safari does something similar with running its plugins in separate processes.


I would very much like to write an extensible application with this level of stability myself. I have found some mentions about ViewBridge.framework and PluginKit.framework. But these seem to be private frameworks that make the Today application work. Is there some public API that I can use? Can anyone please point me to some documentation or examples?


Thank you very much,


Jakub