[Zope] what does _. mean?

[Bryan C. Andregg]

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Thisis really basic, but in dtml that begins with _., such as
_.SecurityGetUser, what does the _. represent?
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Bryan C. Andregg		Duke University Medical Center
 Programmer			Dept. of Anesthesiology
 e <bryan.andregg@duke.edu>
 p +1 919 684 6201

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