1. A computing system, comprising: two or more separate input-device user-interface runtime applications without system-wide active focus to dynamically display images on a dynamic input device, the two or more input-device user-interface runtime applications configured to independently execute within a windowless runtime environment configured to execute in a currently active desktop; and a dominant desktop application with system-wide active focus configured to execute outside of the windowless runtime environment in the currently active desktop, the dominant desktop application configured to selectively utilize the two or more separate input-device user-interface runtime applications and to specify from the two or more separate input-device user-interface runtime applications an input-device user-interface runtime application corresponding to a current context of the dominant desktop application, the specified input-device user-interface runtime application configured to dynamically display virtual controls on the dynamic input device and report activation of the virtual controls to the dominant desktop application while the specified input-device user-interface runtime application does not have system-wide active focus.