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An electronic device enabling one to make long-distance telephone calls without paying: the alleged use of an electronic ''blue box'' to avoid telephone tolls (1970s+ College students)
The complete implementation of the Mac OS run-time environment on the more modern Rhapsody operating system. Blue Box is not an emulation layer; at any given time it will be based on the same source code and ROM image as the current version of Mac OS and will thus incorporate future Mac OS improvements.