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> But to make CLOSOS actually useful, we need an abstraction for having multiple first class global environments.

This seems fine as a research concept but it wouldn't tempt me to use it.

IBM got on fine with CMS just being a single-user operating system.

First class global environments are not about having multiple users on the same machine. Their main purpose is isolation, sandboxing, and reproducibility.

Not every program should be able to modify the compiler, the kernel, or the garbage collector :)

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