The LiveBar at the top right of your Desktop Screen is a unifying experience across SmartApp that shows you which other Users in the Project are also looking at the Item you are looking at. This helps Users to collaborate Live with other Project Team members in any Project that they are part of.
The LiveBar consists of:
Help - Help Articles to guide Users with the Product
Announcements - What's New in the Product
Search - Allows Users to look for an item
My Activities - Shows the Activities of the User
LiveLink - Connect to other Users in SmartApp via video chat.
Streams - Real-time View of activity happening in your SmartApp system.
Comments - See comments other users have left on Items in SmartApp
Users - See Users currently in your project or currently viewing an item you are viewing
Chat - This shows you other Users reviewing the same item as you and allows you to send text messages to each other.
Desktop:
Device Screen: