Techs Seen Heading Lower; Data on Tap  NEW YORK (Reuters) - U.S. technology shares were expected  to open lower on Thursday, weighed down by a sales warning from  Applied Materials Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=AMAT.O target=/stocks/quickinfo/fullquote"&gt;AMAT.O&lt;/A&gt;, while S P and Dow stock  futures were flat before weekly jobless claims data.