This means that any of these new apps developed by you guys is automatically enhanced with fring core functionality including presence, talk, chat, file transfer, auto-roaming and all the rest of it. (i.e. the API provides access to fring client GUI with web browser extensions and basic phone functions).
Not bad off the starting block!
So where do you start? We've opened a new developer site where you'll find the fringAPI documentation and a simple fringAdd-on example. You just need a working knowledge of XML and basic server-side language (e.g. PHP, JSP, ASPX) in order to leverage the API capabilities.