ZZ>
  > Any idea, why closing a notebook causes my main application window
  > to be closed as well? ... and what to do in order to prevent this
  > from happening?
ZZ>

  The default behaviour of WinDefWindowProc when it is passed a WM_CLOSE
  is to post a WM_QUIT message to the message queue for the window,
  which causes your WinGetMessage/WinDispatchMessage loop to end.

  When doing multiple window programming you almost *never* want to pass
  WM_CLOSE to WinDefWindowProc.

  > JdeBP <
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