If you have used View|Split Editor to split EditPad Pro’s editor in two, you can select a different part of the active file in each of the split editors. You can then use the Swap Selections item in the Block menu to swap the two selected blocks. If your file contains the sentence “Harry met Sally” and you select “Harry” in one view and “Sally” in the other view, then Block|Swap Selections changes the sentence into “Sally met Harry”.