OpenDoc was a good idea, but it never quite got off the ground. Apple's goal with OpenDoc was to make the computer "document-centric" instead of "application-centric" . Instead of opening a document with an application, you could access applications as plug-ins, and edit any OpenDoc document with any OpenDoc-compliant software. Unfortunately, Apple quietly stopped developing for OpenDoc a few years ago. The only proof that it ever existed is a vestigial Extension that was required by previous versions of AppleShare IP. In the distance, a novice Mac technician cries, "What's OpenDoc?!?"