Almost all the Spiders follow the links found in the registered page and index all the pages that are found: therefore it is possible to index all the website pages, but paying attention to the structure and to the "depth". Some Spiders go down only one level that is they follow the connections found on the registered page, but not the links found in the connected pages.
If, as often happens, your website has a deep structure (from the Home Page you cannot reach all the pages, accessible from the website sub-categories) not all the pages will be indexed. To resolve the problem you can create and register a .html Summary page containing the connections to all the website pages.