Hi Scott,
That's correct. It's specifically from not using Joomla's "Close" button. So for example, if you exit out of the browser tab, the lock will still be in place.
That's correct, only other users will be prevented from editing. You can edit your own locked items.
Steps for Global Checkin:
1) Go to your admin area
2) Site
3) Maintenance
4) Global Check-in
5) Select all the items that you'd like to check-in. You can also use the "select all" checkmark to the left of "Database Table"
6) Click the "Check-in" button (top right).
Hope this helps! :)
Kind regards,
Nick