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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.

QClipboard | Access to the window system clipboard
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
QMutex | Access serialization between threads
QMutexLocker | Convenience class that simplifies locking and unlocking mutexes
QPixmapCache | Application-wide cache for pixmaps
QReadLocker | Convenience class that simplifies locking and unlocking read-write locks for read access
QReadWriteLock | Read-write locking
QSemaphore | General counting semaphore
QSessionManager | Access to the session manager
QThread | Platform-independent threads
QThreadStorage | Per-thread data storage
QTranslator | Internationalization support for text output
QWaitCondition | Condition variable for synchronizing threads
QWriteLocker | Convenience class that simplifies locking and unlocking read-write locks for write access