Trying to do the Laptop to Laptop dual display!

I just got a MacbookPro 17inch, and I also have my old PowerBookG4 17inch, I'm trying to use my old (now crappy) G4 as a dual monitor. I just spent a good wad of cash on a some cords. For the MacbookPro I got a mini display port (male) to a .DVI (female), and for the G4 I got a DVI (male) to DVI (male). This successfully hooked up the two!!!
I went to my macbookpro and hit "detect displays", and nothing happens.
Ofcourse when I hook either up to a projector or a PC monitor, I can use them as displays, but I cant get these two mac laptops to work together!!!
Do I need to start my old G4 in target disk mode or something? I'm unaware of the solution...
Someone please help me gain new knowledge!!!
-eric

can I revert back to a useable laptop?
Yes. All solutions of this type run through the OS on the second computer. FireWire Target Disk mode just displays a floating FireWire logo on the other display and therefore can't be used for this purpose.
(49643)

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