status.i4.v = dio_device_help_url_c(device_indices.i4a.r,
					    urls.i1a.r, errors.i2a.r

	This routine returns the help URL for a single device or
	a list of devices.

	device_indices	device index or array of device indices
	urls		returned help URL or array of URLs
			(allow DIO_DEVICE_HELP_URL_LENGTH + 1 characters
			 per entry)
			(A value of NULL may be passed if no URL is needed.)
	errors		returned ACNET status value or array of status values
	[num_devices]	number of devices
			(default is 1)
	[verify_url]	flag indicating whether or not to verify the URL exists
			(TRUE -> verify that the URL exists (default),
			 FALSE -> simply calculate what the correct URL
				  should be)

	This function returns status values as follows:

	OK			success
	DIO_BADARG		invalid number of devices passed
	DIO_MEMFAIL		memory allocation failure
	negative value		ACNET format error indicating overall failure
	positive value		number of devices in error indicating partial

	This function requires the following include files:

	cnsparam_h, diolib_h, acnet_errors_h

	Related functions:

	dio_longest_device_help_url, dio_analog_alarm_url_c,
	dio_longest_analog_alarm_url, error_in_list(_c)

	C/C++ usage:

	short	errors[NUM_DEVICES];
	int	status;
	static const int	device_indices[NUM_DEVICES] = {14430, 14431};
	int	num_devices = NUM_DEVICES;
	int	verify_url = TRUE;

	status = dio_device_help_url_c(device_indices,urls,errors,num_devices,