6rounds is a featured Google Wave Extension for Video Chat and Collaboration. It lets you chat with your friends using webcam, and do many other things together, real time.
With Google Wave + 6rounds, you can
- Chat
- View friends’ webcam
- Play games together
- Edit Documents together
- Watch the same video together
- Browse together
- Browse Facebook together
What is Real-Time C0llaboration
All this happen, real-time. If you are unsure of what “real-time” collaboration is, let me explain that real quick.
A collaborative editor is a software application that allows several people to edit a computer file using different computers. There are two types of collaborative editors, real-time and non-real-time. Real-time collaborative editors allow users to edit the same file at the same time. ( wikipedia )
So, when you say watch one video, in real-time, you are watching the same video, on two different computers, two different locations. Suppose you pause the video on your computer, same will happen on your friend’s computer too. Your friend can see every mouse movement  every click you make.