A method for changing display of content associated with user interface objects, comprising: at a computing system comprising one or more processors, memory, a first housing that includes a primary display, and a second housing at least partially containing (i) a physical keyboard and (ii) a touch-sensitive secondary display distinct from the primary display; receiving a request to open an application, characterized by in response to receiving the request: displaying, on the primary display, a plurality of user interface objects associated with the application, the plurality including a first user interface object displayed with its associated content and other user interface objects displayed without their associated content; displaying, on the touch-sensitive secondary display, a set of affordances that each represent one of the plurality of user interface objects; detecting, via the touch-sensitive secondary display, a swipe gesture that includes movement of a contact on the touch-sensitive secondary display in a direction from a first affordance of the set of affordances and to a second affordance of the set of affordances, wherein the first affordance represents the first user interface object and the second affordance represents a second user interface object that is distinct from the first user interface object; and in response to detecting that the contact has moved to the second affordance, updating the primary display to cease displaying associated content for the first user interface object and to display associated content for the second user interface object. at a computing system comprising one or more processors, memory, a first housing that includes a primary display, and a second housing at least partially containing (i) a physical keyboard and (ii) a touch-sensitive secondary display distinct from the primary display; receiving a request to open an application, characterized by in response to receiving the request: displaying, on the primary display, a plurality of user interface objects associated with the application, the plurality including a first user interface object displayed with its associated content and other user interface objects displayed without their associated content; displaying, on the touch-sensitive secondary display, a set of affordances that each represent one of the plurality of user interface objects; detecting, via the touch-sensitive secondary display, a swipe gesture that includes movement of a contact on the touch-sensitive secondary display in a direction from a first affordance of the set of affordances and to a second affordance of the set of affordances, wherein the first affordance represents the first user interface object and the second affordance represents a second user interface object that is distinct from the first user interface object; and in response to detecting that the contact has moved to the second affordance, updating the primary display to cease displaying associated content for the first user interface object and to display associated content for the second user interface object. displaying, on the primary display, a plurality of user interface objects associated with the application, the plurality including a first user interface object displayed with its associated content and other user interface objects displayed without their associated content; displaying, on the touch-sensitive secondary display, a set of affordances that each represent one of the plurality of user interface objects;