ReadonlyareaThe rectangle windows are laid out in.
ReadonlycompactThe area is narrow: every window fills it, whatever the layout.
ReadonlyfocusedReadonlyfreeformWhether the person may move and resize windows now.
ReadonlylayoutThe layout in use.
ReadonlywindowsEvery window, in opening order. The order never changes while a window lives, so a frame is never moved in the document.
Everything a shell needs to draw its windows. A new object is published after every change.