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# Environment Classes

These classes providing various global services to your application such as event handling, access to system settings, internationalization, etc.

QDesktopWidget | Access to screen information on multi-head systems
QEvent | The base class of all event classes. Event objects contain event parameters
QFontDatabase | Information about the fonts available in the underlying window system
QMimeSourceFactory | Extensible provider of mime-typed data
QMutex | Access serialization between threads
QPixmapCache | Application-global cache for pixmaps
QSemaphore | Robust integer semaphore
QSessionManager | Access to the session manager
QThread | Platform-independent threads
QTranslator | Internationalization support for text output
QTranslatorMessage | Translator message and its properties
QWaitCondition | Allows waiting/waking for conditions between threads