RealNetworks Tries to Core Apple RealNetworks launched round two in its heavyweight digital music match against Apple Computer, slashing the cost of its music downloads to take business away from Apple's iTunes download service. &lt;FONT face="verdana,MS Sans Serif,arial,helvetica" size="-2"\ color="#666666"&gt;&lt;B&gt;-washingtonpost.com&lt;/B&gt;&lt;/FONT&gt;