Polycom WEBCOMMANDER 8 - Manual (Page 121)

MGC WebCommander User’s Guide
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5. Select the check box next to the name of the participant to add to the
conference. You can add several participants in one operation by
selecting their check boxes.
6. Click OK to add the participant(s) to the conference.
The Add Participants window closes and the selected participants appear
in the participants list in the Meeting Director/Conference Manager
window.