Section "InputDevice"

    Option "XkbRules"   "xorg"
    Option "XkbModel"   "pc101"
    Option "XkbLayout"  "us,gr"
    Option "XkbOptions" "grp:alt_shift_toggle,grp_led:scroll"
    Option          "XkbOptions"    "grp:alt_shift_toggle"

                                                      # /dev/input/event
                                                      # for USB
    Identifier     "eraser"
    Driver         "wacom"
    Option         "Device" "/dev/wacom"          # Change to 
    Option         "Type" "eraser"
    Option         "ForceDevice" "ISDV4"               # Tablet PC ONLY
EndSection