For the two decades of Windows, the scroll bar control had just a few basic operations. (For expository purposes, let’s assume that the scroll bar is vertical.) There are five mouse targets: The arrows at the ends of the scroll bar scroll by a line. The regions between the thumb and the arrows scroll by a page. And the thumb itself lets you drag the scroll bar to a specific position. Windows 7 added a right-click menu to the scroll bar. This menu gave you four options that matched existing mouse operations, two operations that matched existing keyboard operations, and a new operation. Menu option Mouse Keyboard Scroll Here Drag thumb to position   Top Drag thumb to start Home Bottom Drag thumb to end End Page Up Click in upper gutter PgUp Page Down Click in lower gutter PgDn Scroll Up Click on up-arrow ↑ Scroll Down Click on down-arrow ↓ The interesting new one is “Scroll Here”: You can right-click directly on the spot you want to scroll to, and then pick “Scroll Here”.…