You will be notified by a sound and flashing message on the browser tab when you receive a new chat, and if you use Gmail, a chat window will open automatically, allowing you to read the chat message and reply as required. You can change notification settings as required.
In both Gmail and the Chat app, the person that has sent you a message will show an indicator, and a sound will play.
To change notification settings:
Click on the Active drop-down arrow
Choose Char notification settings
Choose to allow notifications, then the sound to play when a notification is received. You can also choose to recive an email notification for @mentions and direct messages.
Click on the X in the top-left corner of the screen to close the Settings window when complete.
For each conversation in Chat, you can choose to turn notifications off by positioning the mouse over the conversation, clicking on the ellipses, then choosing Turn notifcaitons off.
You can change notification settings for each space that you are a member of, to choose how you are notified of each new message.
Position the mouse over the space you wish to set notifications for
Click on the ellipses and choose Notifications
Choose Notify always to receive a notifications for every new message in the space
Choose Notify less to receive notifications for messages that you are mentioned in and any threads you are following
Choose Notifications off to turn notifications off for the space