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Explain the steps to be followed to use Passport authentication.

1. Install the Passport SDK.
2. Set the application's authentication mode to Passport in Web.config.
3. Set authorization to deny unauthenticated users.
3. Use the PassportAuthentication_OnAuthenticate event to access the user's Passport profile to identify and authorize the user.
4. Implement a sign-out procedure to remove Passport cookies from the user's machine.