Called from the SignInHelper, both before and after token refresh. If there's a token in the hash then refresh has happened, otherwise refresh must start.
The URL to redirect to if redirect should happen.
This is the preferred refresh method. If this fails we won't hear back from the frame and will decide to open the popup.
This is the second choice refresh method.
This refresh method uses the system browser which is assumed to not be the current browser.
Always returns false.
Internal helper class used to assist in security related actions.