This frame pane contains the invisible fisLight word highlighting applet. If you want, this pane can be invisible, contain no text, and be placed vertically or anywhere else on the window.
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How to get a Java VM.

If using Internet Explorer, you may need to allow blocked active content using the Information Bar - see here.
Or better still... go to Tools+Internet Options+Advanced tab then tick "Allow active content from CDs" and/or "Allow active content to run in files".