Show or Hide Cell Comments
Cell comments (they are like a sticky notes for cells) are great for instructions and documentation.
To show all the comments press, in sequence, not held down
Alt r a
This is a toggle, so you can use the same sequence to hide all the comments.
Note: Comments have been renamed Notes in later versions of Excel. Comments now refer to a new features of threaded comments.
Please note: I reserve the right to delete comments that are offensive or off-topic.