You can compare the current working version of a file in Visual Studio to any previous revision in the Dimensions repository.
Right-click the file that contains the revisions you want to compare and select History. The History view appears.
Select the revision, and click the Compare Revisions button. The Merge tool opens and displays the line-by-line differences between the working copy and the revision in Dimensions.
See the Serena Dimensions CM User’s Guide or the Merge tool’s online help.