file_id	IN:	The file identifier returned by Hopen.
	label	IN:	A null-terminated string.

	Purpose	Writes a file label to a file.
	Return value	Returns SUCCEED (or 0) if successful and FAIL (or -1) otherwise.
	Description	These annotations are associated with the file, not with any particular object within the file. The label must be a single string. Use the general purpose routines Hopen and Hclose to manage file access because the file annotation routines will not open and close HDF files for you.
		In the FORTRAN-77 version, the string length for the label should be close to the actual expected string length, because in FORTRAN-77 string lengths generally are assumed to be the declared length of the array that holds the string.

	FORTRAN	integer function daafid(file_id, label)
		integer file_id
		character*(*) label