All that the phrase means is that some of the informational windows
are dockable, and some are shared between plugins. So, for example,
you can have the "Properties" window as a docked window, or undock it
and have it float - which is especially useful if you have a multi-
By shared/private, it means that some of the windows are private, in
that they only apply to a certain type of module within Stylus, whereas
others, like the Properties window, are shared by multiple plugins and
change their content to match whatever document has focus.