Use this command to display the previous page in a document that contains multiple pages. This command is disabled if the first page is already displayed.
Note
If you open a document, you can turn pages without scrolling. You can turn pages with scrolling, by pressing the <PageUp> key while holding down the <Shift> key.
If you use a wheel mouse, you can move to the previous page by scrolling the mouse wheel forward while holding down the <Shift> key.