Abstract: Various user interface systems and methods are disclosed. A primary software application has one or more primary user interfaces that include a data output region. Some primary user interfaces may also have primary input regions. A control application has one or more control interfaces in which control regions are provided. A user may use the input controls using a preferred input modality such as touch input. A primary user interface and a corresponding control interface are displayed in registration on a display screen of a computing system such that the data output region of the primary user interface and the control region of the control interface a simultaneously visible to a user. A software or hardware component within or coupled to the computing system may be controlled using the control interface. Data relating to the component is displayed in the output region.