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If Lync is installed, however, then it will open up the meeting immediately and almost seamlessly. It will display who is in the call, and one can see who else is in the meeting, and their contact card with their Exchange-provided details.
However, if the joining user does not have the Lync client installed, they can use the Lync Web App - the cloud based Silverlight enhanced web application which runs within the browser.
Here you can see the Lync Web App loading (it doesn't take very long for a very comprehensive and feature heavy application) and how it appears on the Lync client application on the desktop.