ClearOne Spontania User Setup Guide - Manual (Page 12)

To add several users to a chat conversation:
 Click twice on a user name in the UIM application to begin the initial chat.
 More users can be added to the chat by dragging their icons from the main page of
the instant messaging application to the chat window.
Group chat participants will receive an invitation to Spontania sessions as shown below:
12 Spontania: User Setup Guide