The History Manager lets you see and compare versions of a file, including multiple backup versions, saved local changes, and the buffer of unsaved changes for the active file. If the current file is under version control, all types of revisions are available in the History Manager.  

The History Manager is displayed on the History tab, which is in the center of the IDE to the right of the Code tab. The History Manager contains the following tabbed pages:

History Manager Toolbar Buttons

Button	Description
	Refresh revision info updates the revision list to include unsaved changes to the file.
	Revert to previous revision makes the selected version the current version and is available on the Contents and Info pages. Reverting a prior version deletes any unsaved changes in the editor buffer.
	Synchronize scrolling synchronizes scrolling in the Contents and Diff pages and the Code Editor. It matches the line of text that contains the cursor with the nearest matching line of text in the other view. If there is no matching text in that region of the file, it matches line numbers.
	Go to next difference repositions the source on the Diff page to the next block of different code.
	Go to previous difference repositions the source on the Diff page to the previous block of different code.
	Follow text movement locates the same line in the source viewer when switching between views.

The following icons are used to represent file versions in the revision lists.  

Revision Icons Used in the History Manager  

Icon	Description
	The latest saved file version.
	A backup file version.
	The file version that is in the buffer and includes unsaved changes.
	A file version that is stored in a version control repository.
	A file version that you have checked out from a version control respository.