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Agencies Find What They're Looking For While the high-profile battle between the major search engines that scour the Web rages on, Convera Corp. in Northern Virginia has quietly carved out a niche for itself: selling software that helps U.S. and foreign intelligence agents search their databases.&lt;FONT face="verdana,MS Sans Serif,arial,helvetica" size="-2" color="#666666"&gt;&lt;B&gt;-The Washington Post&lt;/B&gt;&lt;/FONT&gt; 