dualview: making monitor #2 the "primary" display

I have a Thinkpad T40 laptop with ATI Radeon 7500. I started using
dualview mode so I can use both the laptop screen as well as an
external 19" monitor. The problem with dualview (which is different
than multiple monitors, which does not work with laptops) is that the
laptop screen must be the primary one.

I would like to have all applications launch on the 19" monitor. I only
want to move one or two windows to the laptop screen. I was able to
move the taskbar to the 19" monitor, but when I launch any app, it
still opens in the laptop! Is there some way to accomplish this? I have
ATI's Hydravision software, but that doesn't seem to do this either.