A plug-in software architecture that lets you extend the usefulness of your
     applications by easily adding new functionality. Uses software
     components--called parts--that can be dragged-and-dropped into documents
     created by any OpenDoc-aware application. You can combine parts from different
     Mac OS software developers to add tables, graphs, outlines, and even live
     Internet resources into your documents. Since OpenDoc is a cross-platform
     technology, documents created with OpenDoc can work across different
     computer platforms, including Mac OS, Windows, UNIX, and OS/2. OpenDoc
     1.2.1 includes all the improvements in OpenDoc 1.2, as well as support for Mac
     OS 8.0.


OpenDoc(TM) Version 1.2 and OpenDoc(TM) 1.2.1 were released on
     September 12, 1997. OpenDoc 1.2 requires a Macintosh with 68030 or
     greater with US Mac OS version 7.1.1 or later, or a Power Macintosh with
     US Mac OS version 7.1.2 or later and at least 8MB of memory. OpenDoc
     1.2.1 should be used with US Mac OS 8.0 or later. 

English-North American Mac OS 8.0 or later