Disable auto detect of multiple monitors?

I have my Vista Business notebook connected to a KVM switch with a 20" LCD
monitor attached. When I select the notebook on the KVM I have a dual screen
display with the notebook display and the external LCD.
Every time I select a differnt PC on the KVM, Vista on the notebook auto
detects that the external display is gone and resets the display settings to
a single display.
Is there any way I can disable this auto detect feature?
Any help would be greatly appreciated.