I saw the link to register for free, but then it only gave me the option to pick either iOS development for 99, Mac development for 99, or Safari for free. Just now picked Safari and signed up for developer, but I'm getting the same message when I alt click an object like NSArray and then click NSArray from the popup...Any thoughts?
You do not have access to this resource based on your membership.
Access to technical resources such as pre-release software and associated documentation, and information related to distributing iOS or Mac apps on the App Store are benefits offered to Apple Developer Program members.
Either the Apple ID and password you entered is not associated with an Apple Developer Program, or the Program that you are enrolled in does not have access to this resource.