Блокировка Ctrl+Alt+Del в VB.

Private Const SPI_SCREENSAVERRUNNING = 97&
Private Declare Function SystemParametersInfo Lib "User32" _
Alias "SystemParametersInfoA" _
(ByVal uAction As Long, _
ByVal uParam As Long, _
lpvParam As Any, _
ByVal fuWinIni As Long) As Long
 
Private Sub Form_Load()
Command1.Caption = "Отключить комбинации !"
Command2.Caption = "Включить комбинации !"
End Sub
 
Private Sub Form_Unload(Cancel As Integer)
'Восстановить возможность использ. комбинаций CTRL+ALT+DEL и ALT+TAB
Command2_Click
End Sub
 
Private Sub Command1_Click()
Dim lngRet As Long
Dim blnOld As Boolean
lngRet = SystemParametersInfo(SPI_SCREENSAVERRUNNING, True, _
blnOld, _
0&)
End Sub
 
Private Sub Command2_Click()
Dim lngRet As Long
Dim blnOld As Boolean
lngRet = SystemParametersInfo(SPI_SCREENSAVERRUNNING, False, _
blnOld, _
0&)
End Sub