The kind of pointing device associated with this event.
For example, the device could be a pen, eraser, or cursor pointing device. This property is valid for mouse events with subtype
NSTabletProximityEventSubtype and for
NSTabletProximity events. See Getting Unicode Values for descriptions of valid NSPointingDeviceType constants.
Getting Tablet Proximity Information
var capabilityMask: Int
A mask whose set bits indicate the capabilities of the tablet device that generated this event.
var deviceID: Int
A special identifier that is used to match tablet-pointer and tablet-proximity events.
var tabletID: Int
The USB model identifier of the tablet device associated with this event.