Get someone’s attention by tagging them with an @mention. Type @ before the person’s name. Matching names will display as you type. Select the name you want from the list and it will turn blue (Figure 1):
Figure 1 @mention inside your chat
When you send your message, the person you @mentioned will receive an alert in their toolbar under @Mentions. Likewise, if someone @mentions you, it will appear in your @Mentions (Figure 2 and Figure 3):
Figure 3 View all @mentions in chronological order