Can I duplicate an extended desktop?

Howdy,

Latitude E6430 with a docking station.  I don't know if this is a Dell thing or a Windows thing but here's what I want to do...

Laptop Screen - 1
Two External Monitors - 2 & 3 (both connected through VGA ports on the dock)

I want to take screen 1 and Extend that onto screen 2.  I then want to Duplicate screen 2 onto screen 3.  The end result is screen 1 is the main display and screen 2 and 3 are a mirror extension of that.  So, if I show a Powerpoint, I can control it form the laptop screen (1) and I can have the same presentation showing on screens 2 & 3 for multiple people to view it.

Is that possible?  I haven't found any way to do it through the built in Extend/Duplicate options available in Windows.  I know I can do this with a VGA splitter but I need to knwo if there's a way to do it WITHOUT using a splitter.  Even if I have to install other software to make it work somehow I'd consider that too.

Thanks!