Code:
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" _
(ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Long, _
ByVal lParam As Long) As Long
Private Const WM_SYSCOMMAND = &H112&
Private Const SC_SCREENSAVE = &HF140&
Public Sub StartScreensaver()
Dim lRet As Long
lRet = SendMessage(Form1.hWnd, WM_SYSCOMMAND, SC_SCREENSAVE, 0&)
End Sub