Display changed events.
These events are generated by attaching, detaching the display device, changing the resolution list or change current resolution or backgound (change the current configuration).
Opaque value that changes when the current display configuration has changed.
Compare values in subsequent events to determine whether the current resolution has changed since the last event.
Number of display that has changed, causing this event. This is also known as the screen number, and is zero-based.
See also: CWsScreenDevice::Construct(TInt)