property NeedsUpdate : Boolean
Defines whether the terminal display has changed.
The emulator sets its NeedsUpdate property to True when it makes a change to its terminal buffer object, for example, due to a new character being written or scrolling. The terminal component defined by the Terminal property will read this property every now and then, and if True will call the emulator's LazyPaint method so that the emulator can update the view of the terminal.