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Even that wasn't really OpenGL anymore, even though some internal registers matched OpenGL directly.

The only HW that was truly OpenGL was Silicon Graphics IRIS workstations. IrisGL was released as open standard with some minor changed with the name OpenGL.

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AFAIK even though from a very high level perspective they are similar, in practice IrisGL differs a lot from OpenGL - it isn't just a rename.

Also AFAIK IrisGL had functions for creating windows, etc, that didn't exist in OpenGL (GLUT was meant to bridge that gap).

No, IrisGL did not have any functions for creating Windows, you used libX11 and the Xt toolkit to do that.

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