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ROOT supports its own version of the signal/slot communication mechanism originally featured in Qt, a C++ GUI application framework by the Qt Company.

The Ice Dispenser mechanism revolves and may result in injury. □ Do not touch the mechanism of the automatic ice maker. ○ There is a danger of injury.

Qt's signals and slots mechanism ensures that if you connect a signal to a slot, the slot will be called with the signal's parameters at the right time.