acl_add_remote_message_callback

	status.i4.v = acl_add_remote_message_callback(message_handler.f.v,
						      handler_data.g.v)

	This routine registers a functiom to be called whenever a remote
	ACL message is received by the calling program.

	message_handler	handler function which is called when a remote
			message is received to be called as follows:
			message_handler(handler_data.g.v, message_data.s.r)
			("message_data" is a structure of type
			 REMOTE_ACL_MESSAGE_DATA)
	handler_data	pointer to user-supplied data to be passed to
			the message handler function (default is NULL)

	This function returns ACNET status values as follows:

	OK			success
	CLIB_DUPREQ		requested handler is already registered

	This function requires the following include files:

	cnsparam_h, ul_acl_h:acl_h, acnet_errors_h

	Related functions:

	acl_remove_remote_message_callback

	C/C++ usage:

	int	status;
	void	message_handler(void *handler_data,
				REMOTE_ACL_MESSAGE_DATA *message_data);
	void	*handler_data = (void *) NULL;

	status = acl_add_remote_message_callback(message_handler,handler_data);