To Logon or Not to Logon

Embedded Team

23 Mar 2006 6:44 PM

Comments 5

There have been a few customers asking how they can prevent the Ctrl+Alt+Delete splash screen from being displayed on start. A simple "fix" would be to change the value of the following registry key:

HKLM\Software\Microsoft\Windows\CurrentVersion\policies\sytem\DisableCAD

Set this value to 1 and the "Log on to Windows" dialog box will be suppressed.

The login functionality in Windows is controlled by msgina.dll, which is owned by the Windows Logon (Standard) component. Many customers prefer to write their on logon interface that aligns with their application. For in-depth information on the GINA (Graphical Identification and Authentication) see this security article about creating your own GINA, as well as this article on customizing Winlogon behavior.

-Lynda

Comments

PatriotB

23 Mar 2006 7:12 PM

Just as long as people keep in mind that writing one's own GINA won't be supported in Vista and beyond. (Assumably this applies to embedded versions of Vista as well.)
John W

31 Mar 2006 6:49 AM

The Ctrl+Alt+Delete requirement is a little difficult when you are running a touch screen configuration without an external keyboard. Unless there is another way around this with a touch screen that I'm missing, Microsoft needs to come up with an easier change option.
John W

31 Mar 2006 7:21 AM

Also, My registry did not include the "DisableCAD" statement. It can be added as a DWORD value. Right click system, click new, choose DWORD value. Then right click new line and rename DisableCAD. Then right click DisableCAD, choose modify and change value to 1.
Embedded Team

31 Mar 2006 11:31 AM

John,

Are you using Autologon with your touch screen configuration, so that Ctrl+Alt+Delete is never required?

Lynda
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To Logon or Not to Logon

To Logon or Not to Logon