Removed limitations item claiming that Cocoa bundles cannot be unloaded.

Removed out-of-date reference to iMovie plug-ins.

Added references to the CFPlugIn documentation in the TOC and in the Introduction; changed title from "Dynamic Code Loading."

Replaced references to Core Foundation “Services” with references to new opaque type documentation.

Revision history was added to existing topic. It will be used to record changes to the content of the topic.