I used my WinXP ECS iBuddie notebook for many years with a TV and,
while I didn't do it often, it was able to display 2 separate and
independent screens: movies on the TV and anything else on the
Deskmate's LCD screen. I think it is hardware dependent more than just
software. It may well that some can't do this; my iBuddie was a high
end machine back in 2002 - 2 GHz P-4.