Please enable pop-ups for webmail in your web browser settings. Then turn on eChat by following this tutorial.
Go into the eChat menu.
You will see a list of all the users within your organization.
Users with a green dot indicates they are online and available for chat.
Users with a grey dot are offline
Users with a yellow dot are Busy
Users with a red dot are Away
Listings under Aliases are Group Chats
To open the eChat Messenger window, double click a user with a green dot.
Type your message into this box and press enter/return to send the message.
The eChat Messenger window will automatically pop up on the other user's computer with a sound notification. Each time a message is entered, there will be a sound notification.
In a Group Chat window, this is what it looks like.