If had the cursor at bar 201 but decided to check out something in my intro, let me have essentially a "back" button so that I can go back to 201. The web browser analogy is probably a good one here to follow as far as this. In other words let me maintain a history of cursor positions up to a limit and then let me travel back and forth among those positions. Of course, this may already exists in which case somebody kindly let me know :)