Hi, Is it possible to update two X11-windows during the loops which include two plot() and perhaps lines()-commands? I have been given to understand that you can name the windows like this X11(display = "Device 5"); X11(display = "Device 6"); but how to send the information from different plot- and lines-commands to a certain window? Atte Tenkanen University of Turku, Finland [[alternative text/enriched version deleted]]