[Zope] GET variables..

[After Dark]

Hi, how can I use a variable that I passed through a form
with a GET method?

Example:
-----------
       <form name="busca" action="pesquisa.htm" method=get
target="mainFrame">
         <input name=PrincipiaSearchSource size=12 value="">
         <input type=hidden name=raw ="">
       </form>
-----------

pesquisa.htm

<dtml-if PrincipiaSearchSource>
  <p><dtml-var PrincipiaSearchSource></p>
</dtml-if>
------------

How can I make this work? And if I pass the argument by
link... how can I use the variable?

Thanks.
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