You could use a popup memory form with only one field.
Open the popup NoteMemForm with your button passing the note string as a parameter of the button's OnClick.
That will place the "note" in the NoteMemForm's URL string as a parameter
https://wwwwww.xxx?thenote=xxxxxx
Under the NoteMemForm's priming tab, On Change, NoteField primed with p_web.GetValue('thenote')
Display the NoteField with a text control.
Choose a close button instead of save under the NoteMemForm's buttons tab.
Resize the NoteMemForm to taste.
Done.
Don