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Apple Shares Close at 4-Year High  SAN FRANCISCO (Reuters) - Shares of Apple Computer Inc.  &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=AAPL.O target=/stocks/quickinfo/fullquote"&gt;AAPL.O&lt;/A&gt; on Thursday closed at a four-year high as the iconic  computer maker this week rolled out an iPod that displays  photos and opened nine new iTunes online music stores in  Europe. 