Dual Monitors in XP

Archived from groups: microsoft.public.windowsxp.customize (More info?)

Hi:
I am trying to use a Dell laptop plus a second monitor. I
have an ATI Mobile Radeon 9000 graphics card. I been able
to extend the desktop and everything works fine as long I
leave the laptop as the "primary" monitor. However, I want
the second monitor to be the "primary" monitor. Everytime I
select it as the primary, the laptop screen shows a blank
desktop that does not fill the screen and you can't move
the cursor on or off of it. Any ideas what I need do to
solve this problem.
Thanks