e.g., HASP, via a keyboard
* replying to requests for information
* taking actions such as mounting computer tapes that were "pulled" by a tape librarian
* supervising a tape operator, especially when there is a non-specific mount request.

* May be limited to a specific role and only have the authority to issue commands needed for that role.These individuals would be trained to use specialized equipment related to their duties.

Beyond the IBM System/360 era

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