* This is true when single_touch_id is equal to NO_TOUCHES. If multiple touches
* are down and the touch providing for single touch emulation is lifted,
* single_touch_id is equal to SINGLE_TOUCH_UP. While single touch emulation is
- * occuring, single_touch_id corresponds with the tracking id of the touch used.
+ * occurring, single_touch_id corresponds with the tracking id of the touch used.
*/
#define NO_TOUCHES -1
#define SINGLE_TOUCH_UP -2