Securing Your Spot Once Admitted

How do I fully accept my admission to the program as an undergraduate, graduates, or gap-year student?
How do I fully accept my admission to the program as a high school student?
Where do I view my admission decision?
What is a 'Program Fee'?
What happens after I complete the acceptance process and pay the program fee?
How do I setup my Stanford account?
What should I do while I wait for my Stanford ID number?
How does the waitlist work?