(from Kenan Bektas)
Example xorg.conf for an Elo TouchSystems 2216 AccuTouch® USB Touch-Monitor:
Section "InputDevice" Identifier "elo" Driver "elo" Option "AlwaysCore" Option "MinX" "300" Option "MaxX" "3700" Option "MinY" "300" Option "MaxY" "3700" Option "ScreenNumber" "0" Option "ButtonNumber" "1" EndSection