FCU is an Dienstprogramm for comparing files and directories. The compared fieles are shown in two windows side by side. In a third window the composed (merged) file is shown. An easy user interface is provided for inserting or removing different sections from the left or right file. Directory and subdirectory comparision is possible as well. Customizable accelerator keys, toolbars and user Werkzeuge are a great help for adjusting the user interface for yor needs.