"Going back" and going to the previous page

All hypertext systems share a common feature that has no direct precedent in print media: going "back" through a series of links you have previously visited is not the same as paging "back" through the preceding pages of an ordered sequence of pages. When users click on a hypertext link in a Web document they often are transported from one Web site to another, perhaps even from one country to another. Once made, the hypertext link is bidirectional; you can "go back" to the Web site you just left by clicking on the "Back" button of the viewer. Having hit the "Back" button, you can move to the new Web site again by hitting the "Forward" button: