What's important is that the OP has been able to obtain a most detailed, comprehensive and definitive answer to his original question, thanks to the always civilized, enjoyable and well-informed ET Hardware Forum Community.
Every video card > $50 has 2 outputs at the back...
Usually one classic VGA and one DVI.
You don't need splitters, etc.
Just connect a monitor to each port on back of video card...
One using a standard cable... the other a DVI cable...
And XP does the rest using the "extend my Windows desktop onto this monitor" checkbox.
The quality difference between the 2 is almost imperceptible for any standard app.
I want to thank everybody for the help and explanation. Matrox 14400 is too expensive .
The best thing might be just buy PC with slots which will accept dual or quad card. I think that all PC's with nonintegrated video card are good candidates for that swap. Would be possible to add dual card to existing video card and get triple monitor capability ?
thanks,
hombre