HTC One M8 - Manual (Page 34)

Two-finger swipe
Swipe down from the status bar using two fingers to access Quick
Settings.
Three-finger swipe
§ Swipe up using three fingers to choose a device
where to share content such as photos, videos, and
music from HTC One. You can also share streaming
media from apps such as YouTube
® .
§ Swipe down to disconnect from the device.
Media gesture is turned on in Settings by default, which makes the three-finger
gesture work only when sharing content or using HTC apps.
Three-finger tap
While using the HTC Car app, tap the screen with three fingers
to activate the voice command mode.
34 Your first week with your new phone