HAHA I've only just discovered this weekend that the track pad is actually a track pad! I though it was some kind of a light sensor to detect when the PE was closed!
Personally I've found it to be useful for moving the cursor around while typing (for editing.) I've found that touching the spot with the stylus is often not quite right.. it'll place the cursor on the wrong side of where I want it for example so it's easy to correct that with the pad.
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