> It should also be noted that this directory structure was not
> hierarchical, and directories did not have a .. entry.
While a KeyKOS directory is not hierarchical, one could store a capability to a directory under a name in a conceptual parent directory. It's just that the directory itself didn't know about this usage.
Norm Hardy and I had a discussion a couple of years ago in which we ended up deciding that a hierarchical directory would be a useful thing to have.
shap