In älteren WINDOWS-Versionen - VOR VISTA - gab es den Desktop-Window-Manager noch nicht.
Zitat:
"Fewer repaint messages. When a window is obstructed by another window, the obstructed window does not need to repaint itself."
Repaint-Befehle laufen also ab VISTA in's Leere.
http://msdn.microsoft.com/en-us/libr...=vs.85%29.aspx