Magic Cap (short for Magic Communicating Applications Platform) is a discontinued object-oriented operating system for PDAs developed by General Magic. Tony Fadell was a contributor to the platform, while Darin Adler was an architect.Magic Cap incorporates a room metaphor, where the user navigates from room to room to perform various tasks, such as going to a home office to perform word processing, or to a file room to clean up the system files. Automation is based on mobile agents but not an office assistant. Several electronic companies came to market with Magic Cap devices. The most notable are the Sony Magic Link and the Motorola Envoy, both released in 1994. None of these devices were commercial successes.