The window represents a single page in a notebook. The small text-field in the upper-left corner holds the heading of the page ('The window').
The arrow-shaped button on the right side of the heading is the page-arrow. This button is used to quickly browse between notes stored in the selected topic. The current topic is displayed in the title-bar of the window ('Help').
The document button, on the right of the trash, is used to add a new note. If the <option> key is simultaneously pressed, the page will be inserted before the current note.
The trash button deletes the note which is displayed in the window. The warning dialog will not show up if the <option>-key is pressed. Note that it's impossible to undo this operation.
The minimize button in the top-right corner is used to minimize the window. This can also be done by selecting "Minimize" in the File-menu.
The square in the bottom-left corner displays the number of the current note and the total number of notes in the current topic. The page-bar at the bottom is an alternative way to move to another note.
