HTC One User Manual page 15

15 Your first week with your new phone
Two-finger swipe
In some apps that have sorting, like Mail or People, swipe up or
down using two fingers to scroll the screen. The screen displays the
sorting order, and you can easily scroll to the information you want.
Three-finger swipe
HTC gestures is enabled by default, making the three-finger gesture exclusive for
sharing content. You also won't be able to use multi-finger gestures (gestures that
use three fingers or more) in apps such as games or musical instrument apps.
To use multi-finger gestures in such apps, clear the HTC gestures option in Settings
> Display, gestures & buttons. This disables content sharing.
Swipe up using three fingers to share content such as
photos, videos, and music from HTC Phone to your TV
or speakers.