Page history buttons are built-in navigation buttons that enable you to navigate backwards and forwards through a history of recently viewed pages. VTS remembers the last 15 pages you viewed, regardless as to whether you closed the application or not.
In the last exercise, you added page change buttons for the Booster Station, Alarm, Reports, and Historical Data Viewer pages to the navigation bar. Therefore, the page history should remember the order in which you viewed the pages.
The Historical Data Viewer page should currently be open. In this exercise, we will use the page history buttons to navigate back to the Booster Station application page from the Historical Data Viewer page.
3. Click the Previous Page button to the left of the Display Manager's navigation bar (use the tooltips to locate the button.) The Reports page should open, as it was the last page viewed prior to the Historical Data Viewer page.

4. Click the Previous Page button again. The Alarm page should open, as it was the page viewed prior to the Reports page.
5. Click the Previous Page button again. You are finally returned to the Booster Station page.
The Next Page button that appears to the right of the Previous Page button can be used to move forward through the page history.