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Operating System Requirement:
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On Macintosh: Apple's latest Java update (by running Software Update from the Apple menu in the upper left corner of the Mac).
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To check your Java version in Windows: Use the Start menu to open the Control Panel, open the Java controls, and click the About button. If the Java controls are not present, or your Java version is lower than version 5, visit: http://www.java.com/getjava to get a new version.
To check your Java version in Mac OS X: Launch Terminal app (Applications -> Utilities -> Terminal). Type "java -version" (without quotes). If your version is lower than version 1.5, go to Software Update (under the Apple menu in the upper left corner of your screen).