This will let you revert to the current file on disk, or recall previously loaded files. The 8 most recently loaded files are listed and can directly be recalled by selecting the corresponding file. Note that you can revert to the current file by a single click on Recall, i.e. you don't need to open the Recall menu and select from the list.
Clear List clears the recall list.
The shortcut key for Recall is Ctrl+R.