Radius Pivot.
You could turn it through 90 degrees and the desktop/application window changed orientation automatically.

Twenty years later, what do we have? Open control panel -- or bring up a contextual menu by right clicking in the appropriate place. Change monitor orientation -- was that 90 degrees clockwise or anti-clockwise? Click OK if you can navigate to the button. Swivel monitor. Faff around to reorientate application windows.

Adding an orientation switch to a monitor costs a dollar. Add another dollar for a decent monitor stand. Two dollars is the cost, but they still don't get it.

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