Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for identifying an object. In one aspect, a method includes receiving an image of a first location. The image depicts a layout of objects located at the first location and a visual code for each object. A user interface is generated for the first location using the image and the codes. The user interface depicts the objects and a user interface element for each visual code. Each user interface element is selectable to identify the object associated with the visual code. The user interface is provided for display at a second location. Selection data is received that specifies a selection of a particular user interface element. Command data is sent to a computer located at the first location, which causes the computer to highlight the object associated with the visual code of the selected user interface element.