Kompare makes the task of applying and unapplying differences as simple as point and click. Multiple apply and unapply operations can be performed on a difference as all operations are performed in memory and not written to the files on disk until the save operation is performed.
To apply a difference, click the highlighted difference region, then select → (Space).
To unapply a difference, click the highlighted difference region previously applied, then select → (Backspace).
After reviewing differences between files and finding all acceptable it is possible apply them all with a single operation by selecting → (Ctrl+A).
To revert all differences that have been applied previously select → (Ctrl+U).