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Data Source Name. A DSN is the logical name used to represent an ODBC connection. Within ODBC each DSN is assigned to a specific ODBC driver and often to a specific database. Each DSN maintains information about the configuration of an ODBC driver. DSNs types fall into one of the following categories:
  1. User DSN - DSNs which are specific to the current user.
  2. System DSN - DSNs which are available to all users on the workstation.
  3. File DSN - A DSN for which configuration details are stored in a file rather than in the registry. A file DSN is available to all users who have access to the file.