Events and other input:
http://developer.apple.com/techpubs/macosx/Cocoa/TasksAndConcepts/ProgrammingTopics/Misc/EventsPage.html
Foundation classes (NSMutableDictionary in particular):
http://developer.apple.com/techpubs/macosx/Cocoa/Reference/Foundation/ObjC_classic/FoundationTOC.html
18.191.234.150