faq-splitted/private-sites

• Although I have specified the default landing page for unauthorized users there are still top- and side-bar menus there that reveal some of my content!
• How do I access RSS feeds from private sites?
• How many users (members) are allowed for a private Wiki?
• Is this really secure?
• So who can view a private site?
• What can I use the private site for?
• What does it meen that the site is private (non-public)?