20. The one or more tangible computer-readable media of claim 1 wherein the user interface surface comprises at least one link activatable to navigate to another user interface surface.
20. The one or more tangible computer-readable media of claim 1 wherein the user interface surface comprises at least one link activatable to navigate to another user interface surface. 21. The one or more tangible computer-readable media of claim 20 wherein the method further comprises: storing an indication of the user interface surface in a navigation history.