This post is created by Elaine> at CmsMind.com.
Joomla 1.7 increases it’s security and safety feature by only allowing one user to edit an article/module or extension at a time. After a user edits an article/module or extension, that’s when the Lock or Padlock icon shows beside the item that they are editing. As an administrator you can monitor all items that are [...]
You can read the complete post here Joomla 1.7 Tutorial – What is the Lock Icon?. Please visit WordPress & Joomla Tutorials if you have any questions. Thanks, Elaine