Any note (but not agents, etc) can be opened as a 'tear-off' stand-alone window. The window display the note's $Text and Key Attributes table. Both are editable and will update the source note in the main window. There is no title bar or HTML/Preview tab. Note that drag-drop or link-dragging between windows is not supported.
When a document is reopened, any 'tear-off' text windows that were open when the document was saved are also reopened. These text windows are moved in front of other windows lest they be hidden and forgotten.