It's the Mentant implementation that HP originally bought.  At LCC we had to hacked on it a bit when we put Transparent Network Computing (TNC) stuff in HP-UX  [we had full process migration working BTW -- A real shame that never shipped].

On Sat, Aug 31, 2019 at 5:44 AM Rudi Blom <rudi.j.blom@gmail.com> wrote:
Whenever I hear UNIX, networking and streams I have to think about this scheme.

Still using this, even on HP-UX 11.31 on Itanium rx-servers

Cheers,
uncle rubl