Abstract: The system allows for modification of a software application's user interface screen after compilation and/or distribution. Changes to the interface are permitted during runtime of the application, by associating a unique identification code with each user interface control of the screen. The identification code is used outside of the application to reference the controls, and to update associated information for displaying the controls. The updates may be provided as properties associated with specific identification codes contained in the application, e.g., as a playlist document created and/or received after compiling and distribution of the software application to client devices. The application includes a software development kit (SDK) for managing the receipt and application of playlist updates, prior to display of the user interface by the application. The system enables direct display and manipulation of user interface control properties in creating playlists, and manages playlist distribution, e.g.