NSView and NSWindow class descriptions:
http://developer.apple.com/techpubs/macosx/Cocoa/Reference/ApplicationKit/ObjC_classic/AppKitTOC.html
Handling tracking-rectangle and cursor-update events in views:
http://developer.apple.com/techpubs/macosx/Cocoa/TasksAndConcepts/ProgrammingTopics/CursorMgmt/index.html
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