Verified
At any given time you might see a padlock next to a particular item in Joomla!'s administrative backend. These padlocks might be displayed next to any of the following (Content Items, Menu Items, Modules, etc). The Joomla! system places these padlocks next an item to mention that a user is presently editing (checked out) the item. The lock is eliminated by the sytem while the user clicks on the "Save" button for that item. If the user never clicks save and in spite hits the "Back" button or navigates to another page, then the item remain locked. If another user requires working with the item he or she ought to have the item checked back in before can work.