If you have a ViewSonic Interactive Flat Panel display that is not responding to touch it could be that the "touch" feature has been inadvertently disabled.  To re-enable the "touch" capability do the following:

On the front of the display on the bottom right are a series of buttons:

1. Press the "Volume Up" button 3 times
2. Press the "Settings" button once - this is the button that looks like a "gear"
3. Press the "Home" button once - this is the button that looks like a "house"

Once this sequence is done "Touch" capability will be restored to the IFP