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What it can do is wrap another web page, which is what the message portlet can do. Although, it's pretty weak at the moment, the URL has to be configured, and is not really dynamic. Unfortunately, we don't really have hooks in place to really allow any really strong custom portlets, or any other custom views wrapping an external web page.
Another alternative is to write a custom app that interacts as needed with RHQ via the remote API, and then present that app in the message portlet.
Thanks for your feedback. Yes mashup portlet type work for remote html content through iframe. But i really need to implement owns gwt portlet on top of RHQ. sorry i'm not full understand your second option.
Jay, I think Heiko Braun solved this somehow in the AS console. Isn't this one of the goals of the Errai project?