You will need a graphics card supporting more than 1 monitor. All adaptors should come with the graphics card, if not just make sure youknow the plug types you need.
Read a few of the other multi monitor threads here and it will help answer some key points.
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Computer:
IBM ThinkCentre A50 Series
Pentium(R) 4 CPU 2.80Ghz, 512MB RAM
System:
Microsoft Windows XP
Professional Version 2002 SP2
Graphics Card:
Matrox G450 Multi-Monitor
Integrated 360Mhz
3 x 17" AccuSync LCD71v Screens
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