This code, you may insert in your program, allows to start a screensaver.
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API DeclarationsPrivate 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&