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While I was reading about Base & Bounds memory protection mechanism, I noticed the use of the abbreviation RTU as indicated in the slide below:

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However I didn't know what it means.

So after searching for 'RTU', I found only this article on Wikipedia; But I'm not sure whether it matches the term.

Does anyone have any idea?

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RTU stands for Return To User. This is invoked when the OS first accesses a physical memory range, and upon doing so will return the memory range address (code).

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