Public Class Form1
    Declare Auto Function FindWindow Lib "user32" (ByVal lpClassName As String, _
      ByVal lpWindowName As String) As IntPtr
    Declare Function ShowWindow Lib "user32" (ByVal hWnd As IntPtr, ByVal _
    nCmdShow As Int32) As Boolean
    Const SW_RESTORE As Int32 = 9
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As _
      System.EventArgs) Handles Button1.Click
        ShowWindow(FindWindow(Nothing, "Rechner"), SW_RESTORE)
    End Sub
End Class