>AFAIK "Start New Session" does not lock the current session, 
>whereas
>selecting an existing session will lock the current session. On my 
>systems
>there is a second menu entry for "Lock Current & Start New 
>Session" if it
>is desired to lock the screen before starting the new session.

That is confusing behavior to me. I'll guess confusing to others 
too.

Darrell