In
Finnish: "Virta pois, virta päälle, yhä saman ruudun näämme" (From
MikroBITTI - it
rhymes, so it isn't that easy to translate accurately). Means roughly "
Power off, power on, we still see the same
screen".
Session management mechanism controls that user session in GUI - window locations and possibly even program states - will be saved when the session closes and it will restart all programs when the session starts again.
In X11, many window managers (such as Window Maker) implement this, as does GNOME.
Abbreviated SM. =)