You can view any users notebook as long as you are in the same group as them.
To do this:
Click My Actions and then click Notebook.
If you are using windowed mode:
In the right hand Window, click Actions.
Click View Other notebook.
If you are using full screen mode:
In the right hand Window, click View Other notebook button.
Find and highlight the user's notebook you want to view and click Select.
If there are no other users or the user you are looking for isn't listed, please speak to your companies system administrator to add you into the same group.