I was reading an article on Eurogamer about 'things PCs can learn from consoles regarding 4k content'. One of the takeaways was that it's possible to create an internal custom resolution of say ...

DPI affects all programs and, in addition to font size (names of shortcuts, etc.), affects sizes of icons (e.g., in IE or Firefox toolbars), windows, menus and spacing. It's similar (very generally) ...