The PowerLinks module uses the JAAS framework for authentication. As such there are several mandatory settings elements required in each DeployableComponentConfig.xml file; controlflag, order, mode, operationaltimeout, and openInNewWindow.
Since these elements shouldn't be changed they can be made "read-only" in the DCC.xml. The benefit of making them read-only is that they won't appear at learning context levels below the server level.
 | This article originally authored by Scott Stanley on the WebCT DevNet
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I am not sure the information on this page is correct. My understanding is that only the mode, operationaltimeout, and openInNewWindow are required settings. And I would never normally make the openInNewWindow setting read-only as this may be left to the proxy tool and/or section designer to select a value appropriate to the context.