A method, comprising: at a first electronic device that includes a touch-sensitive display receiving an instruction to operate the first electronic device in a companion-display mode in which user interfaces generated by a second electronic device are displayed at the first electronic device, wherein the second electronic device is separate from the first electronic device; in response to receiving the instruction to operate in the companion-display mode: concurrently displaying, on the touch-sensitive display of the first electronic device: a user interface generated by the second electronic device (443, 444, 445); and a plurality of user interface objects, including a first user interface object associated with a first function of a plurality of functions for controlling the touch-sensitive display of the first electronic device while it is operating in the companion-display mode and a second user interface object associated with a different second function of the plurality of functions, and characterised in that while operating the first electronic device in the companion-display mode: receiving, at the first electronic device, a request to display an application-switching user interface; and in response to the request, concurrently displaying: representations of recently used applications; and a representation of the user interface generated by the second electronic device (443, 444, 445). at a first electronic device that includes a touch-sensitive display receiving an instruction to operate the first electronic device in a companion-display mode in which user interfaces generated by a second electronic device are displayed at the first electronic device, wherein the second electronic device is separate from the first electronic device; in response to receiving the instruction to operate in the companion-display mode: concurrently displaying, on the touch-sensitive display of the first electronic device: a user interface generated by the second electronic device (443, 444, 445); and a plurality of user interface objects, including a first user interface object associated with a first function of a plurality of functions for controlling the touch-sensitive display of the first electronic device while it is operating in the companion-display mode and a second user interface object associated with a different second function of the plurality of functions, and characterised in that while operating the first electronic device in the companion-display mode: receiving, at the first electronic device, a request to display an application-switching user interface; and in response to the request, concurrently displaying: representations of recently used applications; and a representation of the user interface generated by the second electronic device (443, 444, 445). a user interface generated by the second electronic device (443, 444, 445); and a plurality of user interface objects, including a first user interface object associated with a first function of a plurality of functions for controlling the touch-sensitive display of the first electronic device while it is operating in the companion-display mode and a second user interface object associated with a different second function of the plurality of functions, and characterised in that while operating the first electronic device in the companion-display mode: receiving, at the first electronic device, a request to display an application-switching user interface; and in response to the request, concurrently displaying: representations of recently used applications; and a representation of the user interface generated by the second electronic device (443, 444, 445). receiving, at the first electronic device, a request to display an application-switching user interface; and in response to the request, concurrently displaying: representations of recently used applications; and a representation of the user interface generated by the second electronic device (443, 444, 445). representations of recently used applications; and a representation of the user interface generated by the second electronic device (443, 444, 445).