I was once told by a local Human-Computer Interface luminary (who claims to have in-depth knowledge of the way NeXTStep’s UI works) that it’s not possible in any existing GUI to have lines connecting separate windows.
Allow me to introduce a decade-old piece of scotch mist.
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OOP the Easy WayObject-Oriented Programming the Easy Way: a manifesto for reclaiming OOP from three decades of confusion and needless complexity.