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When the Winlogon process starts, it compares its version number to that which is supported by the loaded GINA library. If the GINA library is of a higher version than Winlogon, Windows will not boot. This is done because a GINA library written for a given version of Winlogon will expect a certain set of API calls to be provided by Winlogon.
Support for replacable GINA DLL's was introduced with Windows NT Server 3.51 and Windows NT Workstation 4.0 SP3. Successive versions of Windows have introduced additional functionality into Winlogon, resulting in additional functionality that can be implemented by a replacement GINA. [[Windows 2000]], for example, introduced support for displaying status windows about the current state to the user (e.g. "Applying computer settings..."), and starting applications in the user's context; this facilitates restarting [[Windows Explorer]] automatically if it crashes, as well as starting the Task Manager. [[Windows XP]] introduced some support for [[Remote Desktop Protocol|Remote Desktop]] and a more interactive simplified full-screen logon]].
==See also==
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