Microsoft demonstrated a PC running Windows 8 connected to an 82-inch touchscreen that can support up to 100 touch inputs



From Anandtech:

Microsoft is talking a lot about the importance of touch input to the Windows 8 experience in everything from tablets to high-end desktops. To show just how far you can go with touch, Microsoft demonstrated a PC running Windows 8 connected to an 82-inch touchscreen that can support up to 100 touch inputs (or 10 simultaneous users).

  Microsoft Demos Windows 8 on 82-inch Touchscreen