3.3 IDs and usernames Each user has a username. and each username has an associated user ID. Is it possible for two different usernames to have the same user ID? Is it possible for the same username to have two different user IDs? If you have root access to a machine you can experiment with various combinations. Create two different users with the same user ID but with different usernames and passwords. Can they modify each other's files? What does wiho show? What does 1s -1 show? What does the command id show? What about e-mail? What do the results of these experiments tell you about how some of these commands work? Programming Exercises 105 Can you think of any situations where multiple usernames with the same user ID would be useful