You can compare files two ways; between the configuration database and the VCAT database, and, between two versions of a file within the VCAT database. To show differences between the configuration database and VCAT, right-click a file in DeltaV Explorer, and then select . To show differences of two files within the VCAT database, right-click the file, and then select Show History. From the History dialog, select two versions of the file by using CTRL+click and clicking Differences.