| Phonon::BackendCapabilities | Contains functions to describe the capabilities of the multimedia backend |
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| Phonon | Contains classes and functions for multimedia applications |
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| QDBus | Contains miscellaneous identifiers used throughout the QtDBus library |
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| QGL | Specifies miscellaneous identifiers used in the Qt OpenGL module |
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| QSql | Contains miscellaneous identifiers used throughout the Qt SQL library |
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| QSsl | Declares enums common to all SSL classes in QtNetwork |
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| QTest | Contains all the functions and declarations that are related to the QTestLib tool |
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| Qt | Contains miscellaneous identifiers used throughout the Qt library |
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| QtConcurrent | High-level APIs that make it possible to write multi-threaded programs without using low-level threading primitives |
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