Reusability of Pages and Regions
As with object-oriented principles, it should be possible to define a page or region once and reuse it as part of another page. This reusable page or region should also support parameterized linking, allowing dynamic content or functionality to be passed and adjusted as needed.

Use Case
I accomplished this by creating a new page template without a menu bar or navigation and removing all frames. Then, I built a new page using this template. To display the page, I used its URL in an iframe tag within a static region of the target page, passing parameters directly through the URL.