Graphical Identification and Authentication
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The Graphical Identification and Authentication (GINA) dynamic-link library is a replaceable DLL loaded by the MS Windows executable logon process. The GINA implements the authentication policy of the interactive logon model and is expected to perform all identification and authentication user interactions.
The GINA DLL operates in the context of the Winlogon process and, as such, the GINA DLL is loaded very early in the boot process. The GINA DLL must follow rules so that the integrity of the system is maintained, particularly with respect to interaction with the user.
GINA DLLs are depreciated by Windows Vista.