Modifiers are those common keys on your keyboard that you use in different programs. Most often, you will use them with keyboard shortcuts, like Ctrl-A to select all, or Shift-D to duplicate an image. A whole list is available inside PaintShop Pro. However, you can also use those modifiers with different tools to add functionalities. Although everything is available inside the program, with your cursor, modifiers will speed up the process. Let's look at different tools that use modifiers and what they do.