Magic Cap (short for Magic Communicating Applications Platform) is a discontinued object-oriented operating system for PDAs developed by General Magic. Tony Fadell was in charge of the platform. Darin Adler was an architect. Magic Cap incorporated a "room metaphor", where the user navigated from room to room to perform various tasks (e.g. a home office to perform word processing, or a file room to clean up the system files). The interface resembled that of Microsoft Bob, though Magic Cap lacked an office assistant.