The Emulator can be used for both creating client apps using Qt's built-in sensor gestures, and for creating customized recognizers.
Developing Sensor Gesture Clients
For instance, the Emulator can be used for writing a client app that needs to use the "slam" gesture.
Under the "Sensors" heading in the Emulator control, you will see an edit box for "Sensor gestures" that will contain a list of signals available when your client instantiates a QSensorGesture.
Select "slam", and then click the "Send" button to send a detected("slam") signal to the client.