ann_id	IN:	Annotation identifier returned by ANselect, ANcreate or ANcreatef
	ann_tag	OUT:	Tag of the annotation
	ann_ref	OUT:	Reference number of the annotation

	Purpose	Retrieves the tag/reference number pair of an annotation given its identifier.
	Return value	Returns SUCCEED (or 0) if successful or FAIL (or -1) otherwise.
	Description	ANid2tagref retrieves the tag/reference number pair of the annotation identified by the parameter ann_id. The tag is stored in the parameter ann_tag and the reference number is stored in the parameter ann_ref.
		Possible values returned in ann_tag are DFTAG_DIL (or 104) for a data label, DFTAG_DIA (or 105) for a data description, DFTAG_FID (or 100) for a file label and DFTAG_FD (or 101) for a file description.

	FORTRAN	integer function afidtagref(ann_id, ann_tag, ann_ref)
		integer ann_id, ann_tag, ann_ref