Domain/OS got fat binaries, very much as described in this article, with
the advent of the RISC based DN10000s, follow-on to the Motorola 680x0s.
It was very common to provide locally needed binaries on local disk,
then access the rest across the (ring) network. An administrator could
opt to load the single architectures onto separate shared directories
or could load the fat versions for universal use into a single directory.
This feature made diskless boot support painless.
The accommodation of three different OS conventions (Domain, BSD, and SysV)
was handled in filename space, as described, using environmental variables
which the filesystem used in creating the actual names accessed. It was
very cool, and extremely convenient for setting up personal/group/corporate
The DomainOS "//" convention was used to access the local machine's
"network root", the set of host names known to the local host, a very
neat network naming space for files was the result.