If OpenWindow(0,0,0,500,250,"Window",#PB_Window_SystemMenu|#PB_Window_ScreenCentered|#PB_Window_Invisible)
  SetClassLongPtr_(WindowID(0),#GCL_STYLE,$00020000)
  HideWindow(0,0)
Repeat : Until WaitWindowEvent() = #PB_Event_CloseWindow
EndIf