The Chat section displays Global comments and defects and allows you to create them. It also logs events such as file uploads, marking checklist items and so forth:
|The Review Screen in the Collaborator Eclipse Plug-in doesn't have the Chat section. Instead, the Overall section of the Conversations pane plays the same function when the Review Screen is open.|
You can read more about working with comments and defects in the Review Chats, Comments, and Defects topic.
For the Visual Studio Extension and Eclipse Plug-in, the process of working with comments and defects is described in the Participate in Reviews topic.