Both Dreamweaver 3 and Fireworks 3 offer a new way for web designers and developers to store and retrieve extra information about documents—information such as review comments, change notes, or the source file for a GIF or JPEG—in files called Design Notes.
MMNotes is a C shared library that lets extension authors read and write Design Notes files. Like the DWfile shared library, MMNotes has a JavaScript API that makes it possible to call the functions contained in the library from objects, comands, behaviors, floating palettes, property inspectors, and data translators.
What's different about MMNotes is that it also has a C API that gives other applications an opportunity to read and write Design Notes files. The MMNotes shared library can be used independently of Dreamweaver, even if Dreamweaver is not installed.
For more information about using the Design Notes feature from within Dreamweaver, see Using Dreamweaver.