| startdistance | Pixel distance when multi-touch started. |
| currentdistance | The pixel distance of the touch when the event occurred. |
| cx | The value of the x coordinate (in client coordinates) of the center location. |
| cy | The value of the y-coordinate (in client coordinates) of the center location. |
| flag | Multi-touch status flag. 0x01 : Set to the first event when multi-touch is started. |