/* The user_msg_data is the data supplied when a message was
sent, if this is a response to a sent message. If this is
not a response to a sent message, then user_msg_data will
- be NULL. */
+ be NULL. If the user above is NULL, then this will be the
+ intf. */
void *user_msg_data;
/* Call this when done with the message. It will presumably free