POPLOG

A multi-language programming environment, which includes the

languages Pop-11, ML, Common Lisp and Prolog. It

supports mixed-language programming and incrementalcompilation and includes a comprehensive X Window System

interface. It is built on top of a two-stack virtualmachine, 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)].