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For example, you are required to authenticate your identity and purpose when crossing international borders or completing business transactions.
Similarly, in Windows, the identity of a user or computer must be authenticated before the user or computer has access to files, folders, and applications.
Authentication is mostly automatic, but understanding the protocols, policies, and other elements involved can help you configure and manage authentication—and strengthen security.
For information on how to obtain the Windows XP Professional Resource Kit in its entirety, please see
Related Information Overview Working with Authentication Protocols Managing Credentials Setting Authentication Policy Options Auditing and Troubleshooting Logon and Authentication Additional Resources Authentication takes place all around us.
Firefox will automatically download files to a default location (e.g., to the Desktop or, depending on your operating system, to a special "Downloads" folder) unless you've selected a different download folder or you've set Firefox to ask where to save every file.
   If downloads fail or if Firefox hangs downloading files it may be related to the download location; for example, the download folder may contain a lot of images , may be corrupt or inaccessible  or the folder may no longer exist.