Can jpdk portlets deliver images and other binary files?

From my understanding, portlets can only return text content (html).
Images and pdf files would be impossible to deliver via portlets.
So if you portlet has a link to a pdf or a image, this URL would be a direct reference to that application or file resource, and not be tunnelled through portal?

Q. From my understanding, portlets can only return text content (html).
A. Portlets can return html or mobile content
Images and pdf files would be impossible to deliver via portlets.
Q. So if you portlet has a link to a pdf or a image, this URL would be a direct reference to that application or file resource, and not be tunnelled through portal?
A correct
You may wish to look at the lotto sample which renders gif's

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