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Part 2: The 32-Bit/64-Bit Drivers : The Informix Wire Protocol Driver : Connection Option Descriptions : Data Source Name
  
Data Source Name
Attribute
DataSourceName (DSN)
Purpose
Specifies the name of a data source in your Windows Registry or odbc.ini file.
Valid Values
string
where:
string
is the name of a data source.
Default
None
GUI Tab
General tab