Viewable by the world
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A third option which combines the prior two is a new service that is being tested - bluejeans.com. This can be viewed as a video bridge in the cloud - a service that can connect different technologies and platforms together into one conference. It does require an account (which the IT Help Desk can provide) to initiate a meeting (similar to the Readytalk service that is offered). Participants can include non lab employees.
Go here for instructions on using BlueJeans, once you have an account or are asked to participate in a meeting scheduled by someone else.
Go here for the IT service description for video conferencing options