Abstract: A method, computer program product, and system for playing a series of discrete digital selections, such a MP3 files, from a selection database selected at least in part on user preference ratings, receiving user preference feedback for a particular selection while the particular selection is playing, and altering the user preference rating for the particular selection based upon the user preference feedback received. The user preference feedback may be provided in the form of a new user preference rating or an instruction to increment or decrement the current user preference rating. Alternatively, the user preference feedback may be determined by user interaction with standard controls, such as an increase in a user preference rating for a selection upon determining that a user has replayed the selection.

Abstract: Rather than using a command interpreter or dispatch table, commands within a messaging system are given a name which matches the filename for the class file implementing the command. A command name, or command number, may be subsequently passed to a server in a messaging system and used to dynamically load and instantiate a message command by loading a class of the same name. Additional command classes may therefore be added or deleted, at runtime, from client or server code without halting the application. An error condition is signaled when the command name is unrecognized, when the command code is unavailable or when there are problems instantiating an instance of the command class. Once the class code is loaded, a new instance of the class is created and the command object may be utilized.