The Notes Window shows all the notes for the topmost selected task. You can edit the notes for the task directly in this window. Tasks can have an unlimited number of notes.
The appearance of the Notes Window can be adjusted with File/Options.../Display. All font sizes/colors, and the background color can be adjusted.
Hyperlinked text will perform the appropriate action when you double click on it. Double clicking on an e-mail address or web page (URL) will create an email or open your web browser to that address. Hyperlinked text is shown as blue underlined text.
The Notes Window can be toggled on off with the View/Notes menu command.