Hi Kent,
From my exam experience, it is similar to the Windows Paint App.
Basic features include typing, handwriting, drawing, highlighting. You can zoom out / in to a certain scale (3x if I not wrong). Please note that the earser is very small - will take you more time to delete any specific text. Alternatively, you can clear the whole page with the Clear Function.
The note can be moved around, minimised and rescaled to the size you want. I put notes at the end of my screen so it didnt obstruct my views.
Hope it helps!
Pham