I agree with Mary.
I would add a word about time and focus.
When I first used my finger on a SMARTboard, I was stunned at how much slower navigation with a mouse is.
YMMV but I didn't get that speed from a stylus (on Activboard or Wacom) or infra-red (Easitouch) or inertial gizmo.
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IWB/Smartboards vs Data Projectors
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