Acer Z160 - Manual (Page 17)

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Short press the AcerRAPID button to launch the Google Play Music app. To change
the app for the short press function, open the Application menu and tap Settings >
AcerRAPID > Short press and choose an app.
Tap the ON/OFF switch to enable or disable AcerRAPID.
The AcerRAPID button also allows you to answer incoming calls quickly without
needing to touch the screen. To accept an incoming call, press the AcerRAPID
button.
Note: Only Short press function can be changed. Long press for Camera can be
disabled, but can’t be changed.