Widows features the ability to have an Extended Desktop across your 6 monitors. Then set up each application as a separate window to fill each monitor.
Any modern board with only one spare PCI slot can accommodate 6 monitors with a used quad Matrox or Nvidia video card ($75-$125 on eBay), plus a dualhead in the PCIE or AGP slot. Or, add 2 Matrox Millennium 550 dualheads for about $30 each, or $60, if 2 PCI slots are available.
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