   **********************
    Vista technical note
   **********************

WinVNC cannot simulate the ctrl-alt-del sequence if UAC is disabled and 
ctrl-alt-del (CAD) is enabled

UAC not only displays an "accept" box for elevated apps, but also 
processes the manifest security settings.
If you disable UAC, you also need to disable CAD, else no software 
(including MS onscreen keyboard) will be able to simulate the CAD 
sequence.


*** How to Activate/Desactivate ctrl-alt-del under Vista
(this is only necessary on UltraVNC server side)

Quote:

You can configure the local security policy so the Windows Security 
dialog box will be displayed, requiring all users to press CTRL + ALT + 
DEL to log on. Users will then be prompted to provide a valid username 
and password to access the computer. 

You can configure this option in Windows Vista by using the following 
steps: 

1° Within the Control Panel, click System and Maintenance. 
2° Click Administrative Tools then the Local Security Policy. 
3° Within the console, expand Computer Configuration | 
Windows Settings | Security Settings | Local Policies. 
4° Click Security Options. The various security options are 
displayed in the details pane. 
5° Scroll through the options and locate Interactive Logon: 
Do not require CTRL + ALT + DEL. 
6° Double click the security option. 
7° Select Disabled to require users to press CTRL + ALT + DEL. 
8° Click OK. 



*** How to Enable/Disable UAC under Vista
(this is only necessary on UltraVNC server side)

Quote: 

1° Run MsConfig from Run option. 
2° In System Configuration window, click on the Tools tab. 
3° Scroll down and locate “Disable UAP” or “Disable UAC” option item.
   Click on that line. 
4° Click the Launch button. 
5° A command prompt window will open and automatically execute and run 
   certain process to disable UAC. 
6° Close CMD window when done. 
7° Close Msconfig. 
8° Restart computer for changes to apply and effective. 

To re-enable UAC, simply select “Enable UAP” or “Enable UAC” instead of 
“Disable UAP” or “Disable UAC”, and then click on Launch button. 

