In the Lab - Collaboration

EQ - How do I use the collaboration features of PowerPoint?

1. Activator - PPT Races
2. Lab 1 - Click Here
3. Lab 2 - Click Here
4. Lab 3 - Click Here
5. TOD 
1. What collaborative features do you find easy to use?
2. Difficult?
3. Which do you think you'll use the most?  Why?