h_id	IN:	Access identifier returned by Hstartread, Hstartwrite, or Hnextread
	search_tag	IN:	Tag of the object to be searched for
	search_ref	IN:	Reference number of the object to be searched for

	Purpose	Locates an object in an HDF file.
	Return value	Returns SUCCEED (or 0) if successful and FAIL (or -1) otherwise.
	Description	Simple interface to Hfind that determines if a given tag/reference number pair exists in a file. Wildcards apply.
		Hfind performs all validity checking; this is just a very simple wrapper around it.