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'décarations API
Private Declare Function GetDesktopWindow Lib "user32" () As Long
Private Declare Function GetDC Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function StretchBlt Lib "gdi32" _ 
                               (ByVal hdc As Long, _ 
                               ByVal x As Long, _ 
                               ByVal y As Long, _ 
                               ByVal nWidth As Long, _ 
                               ByVal nHeight As Long, _ 
                               ByVal hSrcDC As Long, _ 
                               ByVal xSrc As Long, _ 
                               ByVal ySrc As Long, _ 
                               ByVal nSrcWidth As Long, _ 
                               ByVal nSrcHeight As Long, _ 
                               ByVal dwRop As Long) As Long


Private Sub Form_Load()
    Form1.AutoRedraw = True
    Form1.ScaleMode = vbPixels
    a = GetDesktopWindow()
    b = GetDC(a)
    StretchBlt Form1.hdc, 0, 0, Screen.Width, Screen.Height, b, 0, _
               Screen.Height, Screen.Width, -Screen.Height, vbSrcCopy
End Sub