What type of device is the source of the pointer? This is a bit-flag that can contain some input source family information.
|Any||Matches with all input sources!|
|CanPress||Matches with any input source that has an activation button!|
|Gaze||Matches with Gaze category input sources.|
|GazeCursor||Matches with mouse cursor simulated gaze as an input source.|
|GazeEyes||Matches with the eye gaze input source.|
|GazeHead||Matches with the head gaze input source.|
|Hand||Matches with any hand input source.|
|HandLeft||Matches with left hand input sources.|
|HandRight||Matches with right hand input sources.|
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