How to rotate one Windows application 90 degrees?

I played with a website design that should work on a portrait widescreen screen. I can simulate this by rotating the entire desktop using the settings of the video card, but it is inconvenient and annoying when the monitor itself is a landscape.

Googling did not bring anything useful, so I throw it here. Has anyone ever tried this? Or am I angry that I even thought about it? I would think that it should be possible to write a layer between the web browser and windows that rotates everything 90 degrees, leaving the browser un-wise. Someone must have thought of this in front of me? :)

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