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)].
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