Suppose the onsite domain field contains:
localhost,webtrends.corp
Page contains the following named link:
<a name=TopOfPage>Top of Page</a>
Page contains the following hyperlink:
<a href="#TopOfPage">Go to top</a>
Clicking the link generates the following parameters:
DCS.dcssip=tagbuilder.webtrends.com
DCS.dcsuri=/Help/EventTracking/Anchor.aspx#TopOfPage
WT.ti=Anchor:#TopOfPage
WT.dl=21