A media content receiver receives a message including an address. The receiver processes the address to determine whether the address is associated with the media content receiver. Additionally, if a removable circuit device is installed in the receiver, the receiver processes the address to determine whether the address is associated with the installed removable circuit device. If the address is associated with the media content receiver, the receiver processes the message. If the address is associated with the removable circuit device, the receiver transfers the message to the removable circuit device, which then processes the message.