Dev:CoreFoundation.framework

CoreFoundation is a cross-platform C-based API that provides reference-counted data structures, IPC facilities, run loops, etc. A subset of it is open-sourced as "CF-Lite".

This framework also provides some crucial Objective-C classes such as NSObject, NSString, NSArray, etc.

For one example of using CoreFoundation version numbers, see Updating extensions for iOS 7#Detecting iOS 7.

Parameters for CoreFoundation applications
CoreFoundation recognizes the following special command-line arguments:

Environment variables
Application built with CoreFoundation will recognize the following environment variables