[aniou]

Nowadays NetBSD offers something similar to "context depended filesystem", i.e. a special form of symbolic links that can points to different locations, according to wide range set of attributes: from domainname via machine_arch to gid.

For details see https://man.netbsd.org/symlink.7 - section Magic symlinks at very end of manual.

[randrus]

I seem to remember something like that in DG/UX too.