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This interview didn't really acknowledge that all modern OSes already have some form of memory management. Most of them track a process' resource usage, and make those resources free when the process ends.

Maybe Mr. Guyer's point was that these processes don't always correspond to users? Some processes such as a login process or graphics subsystem live on after the user logs out, and don't know they can free resources associated with that user? Anyway, he could have been more specific for this audience.