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Before I go to sleep, here's something cool about Hurd:

You can start processes in their exclusive filesystems; it's not mounted anywhere, no one else can see it. (and you can mount more ontop)

In HURD,The filesystem is used as the server nyamespace.
Root directory port is inserted into each task.
The filesystem is a hierarchy of ports connected to their serversThe remap command simply starts a mirror filesystem with set remappings, and starts a program on top of it.

Loonix BTFO