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Tip of the Day
Language: VB4/32,VB5,VB6
Expertise: Intermediate
Jun 24, 2000

Disable the Ctrl-Alt-Del key combination (Windows 9x only)

In Windows 95 and 98, when the screen saver is currently active (and the screen is blanked) the Ctrl-Alt-Del key combination doesn't work, in order to force the user to enter her password. You can take advantage of this feature and programmatically disable this key combination, by making Windows believe that the screen saver is active.

Private Const SPI_SETSCREENSAVERRUNNING = 97
Private Declare Function SystemParametersInfo Lib "user32" Alias _
    "SystemParametersInfoA" (ByVal uAction As Long, ByVal uParam As Long, _
    ByRef lpvParam As Any, ByVal fuWinIni As Long) As Long

' disable the Ctrl-Alt-Del key combination
SystemParametersInfo SPI_SETSCREENSAVERRUNNING, True, ByVal 0&, 0
' ....
' re-enable it
SystemParametersInfo SPI_SETSCREENSAVERRUNNING, False, ByVal 0&, 0
Francesco Balena
 
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