A method includes receiving a broadcast message at a receiver device. The message includes identification information identifying a message-type associated with the message, reply-to information, and user information. The method further includes determining the received message is a broadcast message based on the message-type of the message and determining the message includes the reply-to information describing a reply-to address. The method additionally includes passing the user information contained within the message to a user interface when the message is a broadcast message including reply-to information and receiving an instruction from the user interface. The instruction is based on the user information and user input responsive to the user information. The method further includes producing and sending a reply message addressed to the reply-to address responsive to the instruction.