To ensure that all portlets added to the right-hand column of this layout template have a blue background:
$processor.processColumn
("column-l\ portlet-column-content portlet-column-content-first")
$processor.processColumn
("column-2\ "portlet-column-content portlet-column-content-last")
The service() method in GenericPortlet handles all requests for a particular portlet and dispatches to the appropriate method based on the portlet mode.