Other than searching to the source and getting familiar with it, I don't know of any place to find exactly what you are wanting. I normally just use Windows Search and search for text within all of the files in the source directory. That normally finds exactly what I am looking for fairly quickly.
For a list of some functions, you can try the wiki page for quest objects:
http://www.eqemulator.net/wiki/wikka...a=QuestObjects
It doesn't have all functions, but it can be useful as a reference.