Page is a not externally linkable
europeforvisitors - 2:03 am on Jan 6, 2007 (gmt 0)
So what do you call those things that Google displays when you click "Cached" in a search result (and which Google calls "pages")? :-)
3. Page has no technical definition
Google indexes a url, not a page. For example, if the viewport of your computer displays an html document that contains an iframe, then there is content from two different urls being displayed.