A page can be hidden to prevent it from appearing in the Search, Page Index, Navigation Trees, and other listings. Although hidden Pages are not displayed by default, users can still see them in the following cases:

• They have configured their user profile to show hidden Pages. The xxxh key combination can be used to toggle show/hide hidden Pages when you are on any page, acting as a shortcut for configuring it from your user profile.
• They navigate explicitly to the Page.

More