These classes providing various global services to your application such as event handling, access to system settings, internationalization, etc.
| QClipboard | Access to the window system clipboard |
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| QDesktopWidget | Access to screen information on multi-head systems |
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| QEvent | The base class of all event classes. Event objects contain event parameters |
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| QFontDatabase | Information about the fonts available in the underlying window system |
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| QMutex | Access serialization between threads |
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| QMutexLocker | Convenience class that simplifies locking and unlocking mutexes |
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| QPixmapCache | Application-wide cache for pixmaps |
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| QReadLocker | Convenience class that simplifies locking and unlocking read-write locks for read access |
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| QReadWriteLock | Read-write locking |
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| QSemaphore | General counting semaphore |
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| QSessionManager | Access to the session manager |
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| QThread | Platform-independent threads |
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| QThreadStorage | Per-thread data storage |
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| QTranslator | Internationalization support for text output |
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| QWaitCondition | Condition variable for synchronizing threads |
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| QWriteLocker | Convenience class that simplifies locking and unlocking read-write locks for write access |
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