1. A method of navigating between application contexts in a portable device, comprising: displaying a current application context of a music player application in an application display region of a display; displaying a navigation bar adjacent to the application display region, the navigation bar including at least three horizontally adjacent regions, comprising a current context region for displaying an indicator of a second application context comprising the current application context, a prior context region for displaying an indicator of a first application context comprising an application context preceding the second application context, and a link region for displaying an indicator of a third application context, wherein: the current context region, the prior context region, and the link region each maintain a fixed location on the display in the navigation bar, and the third application context includes a player that controls a song playing in the music player application; upon detecting user selection of the prior context region, shifting operation of the portable device to the first application context, including displaying in the prior context region of the navigation bar an indicator of a fourth application context comprising an application context of the music player application that preceded the first application context; and upon detecting user selection of the link region, shifting operation of the portable device to the third application context, including displaying in the prior context region of the navigation bar an indicator of the second application context.
1. A method of navigating between application contexts in a portable device, comprising: displaying a current application context of a music player application in an application display region of a display; displaying a navigation bar adjacent to the application display region, the navigation bar including at least three horizontally adjacent regions, comprising a current context region for displaying an indicator of a second application context comprising the current application context, a prior context region for displaying an indicator of a first application context comprising an application context preceding the second application context, and a link region for displaying an indicator of a third application context, wherein: the current context region, the prior context region, and the link region each maintain a fixed location on the display in the navigation bar, and the third application context includes a player that controls a song playing in the music player application; upon detecting user selection of the prior context region, shifting operation of the portable device to the first application context, including displaying in the prior context region of the navigation bar an indicator of a fourth application context comprising an application context of the music player application that preceded the first application context; and upon detecting user selection of the link region, shifting operation of the portable device to the third application context, including displaying in the prior context region of the navigation bar an indicator of the second application context. 3. The method of claim 1 , wherein shifting operation of the portable device includes simulating shifting of the application display region to the right upon detecting user selection of the prior context region, and includes simulating shifting of the application display region to the left upon detecting user selection of the link region.