In word processors, for instance, they may jump by an emulated physical page or by a screen view that may show only part of one page or many pages at once depending on zoom factor. The two keys are primarily used to scroll up or down in documents, but the scrolling distance varies between different applications. The Page Up and Page Down keys (sometimes abbreviated as PgUp and PgDn) are two keys commonly found on computer keyboards. The Page Up and Page Down keys among other keys
