usually it changes how the scroll wheel behaves. it either scrolls in steps of n lines (n=1 or n=3 for example), bringing n "new" lines into view with every ste

usually it changes how the scroll wheel behaves. it either scrolls in steps of n lines (n=1 or n=3 for example), bringing n "new" lines into view with every step. Or it scrolls more like in a browser or image editor, where is can also scroll by fractional lines (pixels essentially), which, of course, after the scroll looks the same but during scrolling it looks more "smooth"