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Part 3: The 32-Bit Drivers : The Informix Driver : Connection Option Descriptions : Use Default Login
  
Use Default Login
Attribute
UseDefaultLogin (UDL)
Purpose
Determines where the driver reads login credentials.
Valid Values
0 | 1
Behavior
If set to 0 (Disabled), login credentials are read from the Windows Registry, the connection string, or the Logon to Informix dialog box.
If set to 1 (Enabled), login credentials are read directly from the Informix registry.
Default
0 (Disabled)
GUI Tab
Connection tab