Thanks urgnom. That got me on the right tracks. My crt/lcd switch does not work, but I did a web search and...
I found a command that tells what's connected
and couple of commands that switch between displays
xrandr --output VGA --auto
The link is here: http://yyhh.org/node/12
xrandr --output VGA --off
I am inexperienced and nervous editing files I don't know about. Could somebody help me assigning the command on my crt/lcd switch? Also, how can I change the external monitor resolution? At the moment it is cloned.