Third screen for PBG4

Is there any way I can add a second external screen to my PBG4?
I currently have a 20-inch Flat Plane Array attached to the DVI port of my G4 PowerBook, giving me effectively two screens: the PB's own and the external.
Can I attach a third?
I have heard that the MacBook Pro can attach a third screen, using a device such as the [Matrox TripleHead2Go|http://www.matrox.com/graphics/en/gxm/products/mac/home.php] that diverts the two streams inherent in the DVI interface to two separate screens.
However, the description of the device emphasizes the MacBook Pro, suggesting that maybe lesser computers, such as MacBooks or my PowerBook G4, don't support the dual-stream part of the DVI interface.
Is this so?
If so, is there another way to do this? Another device, maybe?
If the third monitor were a mirror of the external screen, that would be useful. I'd like to set up the third screen so that visitors can see it from the other side of my desk.
I'd appreciate your suggestions.
--Gil

The 12" PowerBook does indeed lack the dual-link DVI capability which is required by the Matrox expansion module, but the 15" and 17" PowerBooks which have it are not listed as compatible either. I'm not sure whether this concept (split an ultra-wide desktop horizontally into two or more portions on individual displays) would suit your purpose anyhow.
Do you want the additional external display for your visitors to show the same image as your own external display? Then you could use a generic splitter/repeater box which feeds the display output of your PowerBook to multiple screens. Several models exist for both VGA and DVI signals.
There are also USB graphics adapters which provide independent displays, but they are handicapped by the USB bottleneck and I know of none which has driver support for PPC Macs.

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