Internet streaming from broadcast radio or television stations is described wherein triggers for dynamic content originated from a system having a TCP Channel to a TCP Distribution Service are received by an encoder system also having a TCP Channel, and cause the encoder system to generate command messages, and optionally to synchronize those command messages with any delays associated with the triggering events. Command messages are delivered through a streaming media distribution system to client media players which obtain or present the dynamic content, in association with any desired configuration changes to the appearance of the media player or the method or manner in which the dynamic content is presented.