Put the contents of a page inside an iframe. This is typically used when a page is being used to traverse a result-set that spans multiple screens.

• return: The page output to finish off our current page stream such that it will spawn the iframe (NULL: not internalised)

• tempcode $title: The title
• ?integer $refresh_time: The time between refreshes (NULL: do not refresh)
• ?mixed $refresh_if_changed: Data. A refresh will only happen if an AJAX-check indicates this data has changed (NULL: no check)