In this video, Bob is explaining how to use the compare feature in HP Tuners VCM Editor.   The student asks about how to tell if the compare file is open.  Bob describes the top title bar and how to see which file is being compared and then shows the Comparison Log feature which is the main tool to allow you to see the summary of changes between the two files being compared.  Now he can see the differences between the two files and easily see where they are located in the file.