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In a presentation via technology such as Skype or Google Hangouts, two very useful features for establishing your audience and managing what they see are the functions for group chat/video and screen sharing. Group chat can be used on the day of your presentation to add audience participants from a contact list. You can then change the name of the chat to reflect the purpose of the meeting (your presentation), type in a welcome message, and send out any advance files (agenda, slides). Group video will allow you to see all participants individually. If available, you can also use screen sharing to allow your audience members to view your presentation aids on their computers.