Screen Share / Publishing and Viewing

I noticed on the Red5 test page you can test the Publish and View desktop.

This works perfectly, its actually quite impressive.

However, Ive manage to setup some spark clients who are using the video calling, but I cant find anywhere for the desktop publishing / viewing options.

Is a seperate plugin required for this?

One other question, if a UserA without a web cam initiates a video confrence with UserB who does have a web cam, it will not display the web cam image for UserA.

Is this normal?