HTC One User Manual page 41

Opening an app or folder from the lock screen
On the lock screen, drag an app or folder icon up to unlock the
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screen and directly go to the app or folder.
The shortcuts on the lock screen are the same ones on your Home
screen's launch bar. To change the lock screen shortcuts, replace
the apps or folders on the launch bar.
When there's a notification or info shown on the lock screen such
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as a missed call or new message, you can drag it up to directly go
to its app.
If you've set up a screen lock, you'll be asked to provide your credentials
first before HTC One opens the app or folder.
Switching between recently opened apps
When you're multitasking and using different apps on HTC One, you can
easily switch between the apps you've recently opened.
Double-tap to see recently-opened apps.
Your first week with your new phone 41