Abstract: A system and method for permitting entry into a defined operational mode of a software application on a selective basis. To enter the limited-access mode, action must be taken at both a server and a client device. The client device stores a software application that is configured with inactive functionality for entering the predefined mode in response to user input. The server is operable to provide very limited distribution of configuration settings data to activate the functionality for recognizing predefined user input and responsively entering the predefined mode. The required predefined user input is a widely-kept secret to which access is extremely limited, and is identified to users only an as-needed basis. Accordingly, access to the defined mode is limited to users (i) having a computing device that has received the configuration settings data enabling recognition of the predefined user input, and (ii) knowing and providing the predefined user input.

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.