I wondered too before, but never bothered finding out, but now I did...
From
http://www.aota.net/forums/showthread.php?t=20868:
Quote:
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The difference is that _new is not a valid target name, while _blank is. In practice both will work and will open a new window, but a window created with "target=_new" will be a named window, with target="_blank" a new unnamed window is opened.
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