Poplog

from The Free On-line Dictionary of Computing (8 July 2008)

POPLOG

   A multi-language programming environment, which includes the
   languages {Pop-11}, {ML}, {Common Lisp} and {Prolog}.  It
   supports mixed-language programming and {incremental
   compilation} and includes a comprehensive {X Window System}
   interface.  It is built on top of a two-stack {virtual
   machine}, PVM.  POPLOG was developed at the University of
   Sussex, Brighton, UK.

   ["POPLOG's Two-Level Virtual Machine Support for Interactive
   Languages", R. Smith et al, in Research Directions in
   Cognitive Science, v.5 (1992)].