Each Application pane maintains a history of the nodes you have visited in this pane. You can navigate these nodes using the View > Go Back to the Previous Node and View > Go to the Next Node menu items, or with the equivalent toolbar buttons:
Also on some forms a green arrow button provides a link to another node (typically a template) in the same Application pane:
Page url: http://www.zeroc.com/doc/Ice-3.4.2/IceGridAdmin/index.html?app_navigation.htm