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Page zero of your application functions as a master page. The Application Express engine renders all components you add to page zero on every page within your application. You can further control whether or not the Application Express engine renders a component or runs a computation, validation, or process by defining conditions.
To create a page zero:
On the Workspace home page, click Application Builder.
Select an application.
The Application home page appears.
Click the Create Page button.
For Select a page type, select Page Zero.
Note that the Page Zero option only appears if the application does not have a page zero.
Click Finish.