not quite split i and d but i do have a memory of some code which could run in three parts
as overlays.
this could have been through exec’ing the next overlay with an appropriate argv and a pipe
or file of data, or, perhaps there was some kernel support for overlays in early unix.
anyone seen evidence of this?
sadly i cannot remember where i saw it, i want to say it was a versatex printer driver but
i am pretty sure that is rubbish.
-Steve