如何在javascript上实现禁用ctrl alt del键

一个窗体文件FORM1.FRM,一个模块

'窗体代码开始:(保存为FORM1.FRM)
'////////////////////////////////////////////////////////
VERSION 5.00
Begin VB.Form Form1
Caption = "CTRL +ALT + DEL"
ClientHeight = 735
ClientLeft = 60
ClientTop = 450
ClientWidth = 4155
LinkTopic = "Form1"
ScaleHeight = 735
ScaleWidth = 4155
StartUpPosition = 3 '窗口缺省
Begin VB.CommandButton Command3
Caption = "启用"
Height = 495
Left = 2160
TabIndex = 1
Top = 120
Width = 1695
End
Begin VB.CommandButton Command1
Caption = "禁用"
Height = 495
Left = 240
TabIndex = 0
Top = 120
Width = 1695
End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Expli