LinkBack is an open source framework for Mac OS X that helps developers integrate content from other applications into their own. A user can paste content from any LinkBack-enabled application into another and reopen that content later for editing with just a double-click. Changes will automatically appear in the original document again when you save.
If you are an end user, use LinkBack with any of the LinkBack-enabled applications available from some of your favorite software companies. If you are a developer, download the SDK to learn more about how easy it is to use LinkBack in your own application.