Dual processor laptops?

[scott at MIT.EDU (Scott Ehrlich)]

I've been asked to spec out a dual processor laptop.  What is the 
difference between Intel's Duo and having dual processors?  I've heard 
that the Duo Core puts two processors back-to-back, affectively making it 
a dual processor.  Is this correct?   How does this really differ, if at 
all, from having two separate processors on the motherboard?

We are largely a Dell shop, but I don't have to go solely with Dell. 
Ignore budgets for now.

Thanks for leads.

Scott

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