The dictionary is a PDF file that lists which methods and properties are associated with InDesign objects. I use this when I need to look up something like 'What is this-or-that a property of?' or 'How to set user interaction again?'. You can do all this in the scripting reference, too, but I find this file easier to use because it is more compact.
The list was produced using Teus de Jong's object browser, and is in fact a long searchable print of what you see in Teus's program. Items in blue were introduced in InDesign 4 (CS2).
Peter Kahrel -- contact