Call Manager lets you chat in the meeting with several options available to you. You can chat directly with anyone on the call or you can even select a specific Room to chat into, assuming the Moderator has created one or more breakout rooms in the conference.
To initiate a chat, click the icon found in the menu in the top right corner of Call Manager.
This will open a chat window and you can select your options from there. Easy and effective for communicating during the call without disturbing the actual call itself.