Google ANDROID Quick Start Guide (4.4, KitKat) - Manual (Page 21)

ANDROID QUICK START GUIDE ESSENTIALS 17
Certain notifications can be expanded to show more information,
such as email previews or calendar events. The one at the top
is always expanded when possible. To expand a notification,
position one finger inside it and swipe down slowly.
To open the related app, touch the notification icon on the left.
Some notifications also allow you to take specific actions by
touching icons within the notification. For example, Calendar
notifications allow you to Snooze (remind you later) or send
email to other guests.
When you’ve finished with a notification, just swipe it away. To
dismiss all notifications, touch the Dismiss icon in the top right.
Touch to
respond
to other
guests
Swipe down
using one
finger to
expand
certain
notifications
Dismiss all