1. A configurable, wall-mountable controller, including: a wall-mountable subassembly including circuitry operable in a learning mode, a cloning mode, and a control mode; an infrared receiver coupled to the circuitry; an infrared emitter coupled to the circuitry; and control keys coupled to the subassembly, wherein the circuitry in the learning mode is configurable to perform control operations in response to actuations of the control keys in the control mode, when performing said control operations the circuitry generates emulated versions of signals received at the infrared receiver during the learning mode, and the circuitry is operable in the cloning mode to learn the configuration of a second device including by receiving at the infrared receiver modulated infrared signals that have been transmitted during the cloning mode to said infrared receiver from the second device and adopting said configuration of the second device in response to configuration data indicated by the modulated infrared signals, wherein the circuitry in the learning mode is configurable to generate an emulated version of a signal, received at the infrared receiver during the learning mode after designation of one of the control keys, in response to actuation of said one of the control keys in the control mode, and wherein the controller in the control mode is operable to control a target to cause the target to receive content from a selected source, the controller includes a control output at which said controller asserts, during the control mode, the emulated versions of signals received at the infrared receiver during the learning mode, wherein said controller also has a surface, the control keys are in regions of the surface, said controller includes no source input configured to be coupled to the selected source, and the control keys include: a first key set in a first region of the surface; a second key set in a second region of the surface, where the second region is distinct from the first region and each of the first key set and the second key set includes at least one of the control keys, and wherein the circuitry includes switches, the switches include at least one switch that is actuatable in response to actuation of at least one key of the first key set and at least one other switch that is actuatable in response to actuation of at least one key of the second key set, and the circuitry is configurable in the learning mode to perform at least one control operation of a first type in response to actuation of a key of the first key set and to perform at least one control operation of a second type in response to actuation of a key of the second key set, but not to perform a control operation of the second type in response to actuation of any key of the first key set or to perform a control operation of the first type in response to actuation of any key of the second key set.