Hello,
The same way there is a framework and API to add events and reminders to the Mac calendars, I'd like to know if there is an API to create notes from a custom application, so that they will later be accessible through the OS X Notes application ?
Thank you.
I haven't heard of anything like this, so chances are there isn't a framework to do what you're thinking about. However, Apple does accept and consider specific enhancement requests. You can file those using the Bug Reporter tool (bugreport.apple.com); just create an new bug report and choose the "Enhancement" category.