Originally Posted by DWB

If I have a site that offers an API, you could pull data (images, video, text) from my site, based on what I allow in the API, and you add it to your site. You could add it to your tours, your members area, whatever. And the content could be whatever I could create, members content, webcam, date profiles, or whatever you can dream up.

Though it is not an iframe, for the sake of truing to explain it to you, think of it as an advanced iframe.