Monitor Turn Off

Dear Sir
I am glad to send you my question which may help in finding a solution.

I am the admin. of a Software Eng. company, but we are using Unix platform, and I am not an expert in Windows platform.
Our problem is very simple, we have about 20 Windows NT4 machines, and as you might know there is no automatic screen turn off option, and its so important to have this option. We tried to code a small Windows application to turn off the monitor using windows APIs, but we were unable to do that...

Can you help us ...

You can't turn it off par se, but you can put it in power saving mode if it supports it

VB Code:

Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" _
(ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Integer, _
ByVal lParam As Any) As Long
 
Private Const WM_SYSCOMMAND = &H112
Private Const SC_MONITORPOWER = &HF170
Dim l As Long
 
Private Sub Command1_Click()
'To turn off the monitor:
    l = SendMessage(Form1.hwnd, WM_SYSCOMMAND, SC_MONITORPOWER, 2&)
End Sub
 
Private Sub Command2_Click()
'Standby monitor:
    l = SendMessage(Form1.hwnd, WM_SYSCOMMAND, SC_MONITORPOWER, 1&)
End Sub
 
Private Sub Command3_Click()
'To turn on the monitor:
    l = SendMessage(Form1.hwnd, WM_SYSCOMMAND, SC_MONITORPOWER, -1&)
End Sub