LiveSite Page "Requires Login" questions.

Bowker

My original question:
What does setting the "Requires Login" check box on a LS page really do?

My best guess:
My guess is that the current [RequestContext].[UserSession].isLoggedIn() is checked and if the user is not logged in, the site's login page is displayed.

As long as [RequestContext].[UserSession].setLoggedIn(true) is called for the session then the page is displayed.

Am I on the right track?

Two other related questions:
1 - Is targeting information stored in the [RequestContext].[UserSession] object somewhere? (Say in the "attributes"?)
2 - what is "isRecognized()" used for?