Notes, emails and to-do lists in a window of their own

Double-click a note, an email or a to-do list, or choose Open in new window in the menu of a note or an email, or at the top of a to-do list: it opens alone in a window of its own, named after it, also in the app for Mac and Windows. Keep several side by side; what you change in one shows in the others straight away. New window in the command menu opens all of SiteBirdy again, and in the app so does ⇧⌘N (Ctrl+Shift+N).