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<mvt:assign name="g.url" value="'http://www.miva.com'" />

<mvt:call action="g.url" method="'POST'" fields="'name=brennan,age=31'">
    <mvt:eval expr="s.callvalue" />
</mvt:call>

Note: Here the fields list is a comma seperated list of name value pairs. You can also pass in variables, and they will 
be automatically converted into name value pairs

//get google.com homepage and return the source
<mvt:call action="'http://www.google.com'" method="'GET'">
    <mvt:eval expr="s.callvalue" />
</mvt:call>