This is a link that contains the title of the column in the list. The sorting headers can be available for each column, placed above it. This sorting header links can be disabled by the padmin.
Metainfo:
Author: factline factline; Copyright: factline Webservices GmbH; Published by: Webservices factline 4 (factline4) factID: 1421238.1; published on 14 Jan. 2010 10:51