sallyboy
I have never worked with a voodoo card so I cannot speak from experience. I hope that someone who has a voodoo card and a G450 replies to this thread. However, I can tell you that in theory it should work. You could add a G450 PCI card and install the new drivers for that card and your dual head should work fine. If you have Win2k, that OS has been enhanced so that it can better support multiple monitors. You should be able to do it with Win98SE also. Worst case is that if you buy a G450 PCI and it doesn't work well with your AGP card then you would have to buy either a G450 AGP or a G450 eTV. The straight G450 AGP would be cheaper. Matrox sells it for around $135.00, vendors at pricewatch.com have it for cheaper. If you do not need the multimedia features of the eTV than the G450 AGP would be ample for trading. Also check the Matrox site and the 3d site as they may have some unified drivers that will enhance the functioning of those two cards in the same computer.
As to only using your primary display when you also have two other monitors connected, that is not a problem either. You can either just turn off the other two monitors, or unplug them from the vid card if you want a more permanent solution. I am not familiar with Appian or other brand dualhead cards, but Matrox cards come with software that enables you to place icons only on you primary display if you wish, or on all of your displays, by checking the right box. The software will remember where you placed the icons last and will place them back on the same monitor or area of the desktop you last had them when you rebooted or turned off the computer. In your case you would probably leave them all on your primary display, so when you used only your primary monitor all your shortcuts would be there.