I think you probably want to display an inline frame in a template component. The white space would be your template Component. You would render it if certain conditions are met that could be set by a clicking a button. You could make the URL of the inline frame dynamic so that you can force it to load a specific website, or you could make several template components and render only one at a time. However, I don’t think Salesforce pages cant be displayed as inline frames due to click-jack protection.
