Permissions & privacy

1. What is a private to-do list? What does it mean to make something private?
2. What is an administrator (aka admin)? Can we have multiple admins? How do I give someone admin access?
3. What are the different levels of access for people in my company or people in other companies (clients, freelancers, contractors, etc.)?
4. How do I add a person or company to a project?
5. Can I keep certain people/clients from seeing specific projects? How do we set permissions?
6. Can I move people between companies?
7. How does the privacy setting work in Basecamp?
8. How can I add groups or departments?
9. What do clients see when they login? Do clients have a Dashboard?
10. One of my users can't login, what should they do?
11. I added a new person and they can login but they can't see any projects!
12. Can our clients see time tracking information?
13. Can everyone see everyone else? Can I hide contact information from other people?
14. How do I add a person from a different company to a project?
15. Where do I specify who can see which projects?
16. I'm getting emails from Basecamp but I still can't login.
17. Can I make milestones private?